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Tytuł:
Phase separations in highly correlated materials
Autorzy:
Marcelli, A.
Powiązania:
https://bibliotekanauki.pl/articles/1065210.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.05.cj
Opis:
The X-ray absorption near edge structure spectroscopy is a unique powerful local and fast experimental method to study complex systems since it probes the nanoscale structure around selected atoms giving evidence for different local and instantaneous phases present in multiscale highly correlated granular systems. Transition metals and rare earth oxides like manganites, cuprates or pnictides superconductors show a rich variety of different competing structural, electronic and magnetic phases, which spatially coexist forming complex lattice textures. Many recent experimental data have pointed out the presence of arrested phase separation and the interplay of different phases occurring from nano- to micrometer-scale. This scenario opens the possibility to manipulate the mesoscopic phases to get new material functionalities. Therefore there is increasing need to develop methods to probe morphology and phase distribution at multiple length scales. Actually, combining X-ray imaging at high spatial resolution with μ-XANES spectroscopy both mesoscale, nanoscale and atomic structural changes can be identified. The μ-XANES spectroscopy technique is rapidly growing to investigate adaptive matter, high temperature superconductors, complex materials showing arrested phase separation at the mesoscale.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 264-269
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Structure and Conductivity of Superionic Conducting Materials Obtained on the Basis of Silver Iodide
Autorzy:
Wiśniewski, Z.
Górski, L.
Zasada, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813180.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.43.Fs
Opis:
Conductivity and structure of materials belonging to pseudo-binominal group $(AgI-Ag_2MoO_4)$ were investigated. Structure was investigated by X-ray and scanning electron microscopy techniques. It was found that described materials present a variety of internal structures. This type of structures affects conductivity at room temperature, so there is correspondence between conductivity and structure.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1231-1236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Study of Fe-Si(Ge)-Nb-Cu-B Finemet Alloys
Autorzy:
Michalik, S.
Bednarcik, J.
Brzózka, K.
Sovak, P.
Górka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1534048.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.05.C-
61.46.Hk
Opis:
Structural changes in Finemet based alloys invoked by germanium replacement for silicon were investigated using the X-ray diffraction, the X-ray absorption spectroscopy and the Mössbauer spectroscopy. Ge substitution preserves a nanostructural character of annealed samples at temperature 550°C; specifically the formation of a $DO_3$-type with about 19 at.% of (Si,Ge) was confirmed. The mean size of nanocrystals was estimated to be about 7 nm.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 818-819
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Lattice Parameters Variation of $CaCu_xMn_{7-x}O_{12}$ Compounds with Trigonal Crystal Structure
Autorzy:
Sławiński, W.
Przeniosło, R.
Sosnowska, I.
Bieringer, M.
Margiolaki, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813179.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
65.40.De
Opis:
We report the crystal structure evolution of $CaCu_{0.2}Mn_{6.8}O_{12}$ as a function of temperature between 10 K and 290 K. The analysis of the diffraction data is carried out with the Rietveld method applied to the average trigonal structure of $CaCu_{0.2}Mn_{6.8}O_{12}$. The x = 0.2 member shows similar low temperature extrema for the unit cell parameter evolution as the previously reported x = 0.1 and x = 0 members of the $CaCu_xMn_{7-x}O_{12}$ system. All magnetic and crystallographic transition temperatures indicated by the unit cell parameter evolution obtained by powder X-ray diffraction methods systematically decrease with increasing Cu content, x.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1225-1230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revealing the Defects Introduced in N- or Ge-doped Cz-Si by γ Irradiation and High Temperature-High Pressure Treatment
Autorzy:
Wieteska, K.
Misiuk, A.
Prujszczyk, M.
Wierzchowski, W.
Surma, B.
Bąk-Misiuk, J.
Romanowski, P.
Shalimov, A.
Capan, I.
Yang, D.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1812256.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.c-
61.72.-y
61.82.-d
Opis:
Effect of processing under high hydrostatic pressure (= 1.1 GPa), applied at 1270 K, on Czochralski grown silicon with interstitial oxygen content $(c_O)$ up to $1.1×10^{18} cm^{-3}$, admixed with N or Ge (Si-N, c_N ≤ $1.2×10^{15} cm^{-3}$, or Si-Ge, $c_{Ge} ≈ 7×10^{17} cm^{-3}$, respectively), pre-annealed at up to 1400 K and next irradiated withγ-rays (dose, D up to 2530 Mrad, at energy E = 1.2 MeV), was investigated by high resolution X-ray diffraction, Fourier transform infrared spectroscopy, and synchrotron topography. Processing of γ-irradiated Si-N and Si-Ge under high pressure leads to stimulated precipitation of oxygen at the nucleation sites created by irradiation. It means that radiation history of Si-N and Si-Ge can be revealed by appropriate high temperature-high pressure processing.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 439-446
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of NbN and Nb-Si-N Coatings Deposited by Magnetron Sputtering
Autorzy:
Ivashchenko, V.
Scrynskyy, P.
Lytvyn, O.
Rogoz, V.
Sobol, O.
Kuzmenko, A.
Komsta, H.
Karvat, C.
Powiązania:
https://bibliotekanauki.pl/articles/1402242.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.05.cp
68.37.Ps
61.05.js
Opis:
NbN and Nb-Si-N films were deposited by magnetron sputtering the Nb and Si targets on silicon wafers at various bias voltages, Uₛ. The deposited films were annealed to establish their thermal stability. The films were investigated by atomic force microscope, X-ray diffraction, X-ray photoelectron spectroscopy and nanoindentation. The NbN films were nanostructured, and the Nb-Si-N films had a nanocomposite structure, and represented an aggregation of δ-NbNₓ nanocrystallites embedded into the amorphous Si₃N₄ tissue (nc-δ-NbNₓ/a-Si₃N₄).
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 949-952
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural, morphological and optical study of bismuth and Zinc Co-doped yttrium oxide prepared by solvothermal and wet chemical method
Autorzy:
Bhavani, G.
Ganesan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1058867.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
61.05.C-
61.72.sd
Opis:
Yttrium oxide (Y₂O₃) is the most familiar yttrium compound, which is popularly known as host for ion doping of other rare earth elements. Bismuth ion (Bi³⁺) is well known as an activator and sensitizer in several particular phosphors. Zinc oxide (ZnO) nanomaterial, having a wide band gap, is one of the promising candidates for general illumination applications due to its high optical transparency and color tenability bismuth (Bi) and zinc (Zn) co-doped Y₂O₃ samples are synthesized by simple precipitation techniques like solvothermal and wet chemical methods. The prepared samples were characterized using X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectra, ultraviolet-visible absorbance spectroscopy and photoluminescence spectrophotometry. Ultraviolet-visible absorption studies showed absorption only around 340 nm whereas photoluminescence shows peaks around 500 nm, 680 nm, and 1020 nm for Bi and Zn co-doped Y₂O₃. The photoluminescence spectrum shows emission in blue region (500 nm) due to Zn dopant and red and near infrared region (680 and 1020 nm) due to Bi dopant. This is a new material which can effectively work as an efficient and cheap red phosphor.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1373-1379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of Nanostructured Fe-Doped SnO₂
Autorzy:
Saleh, S.
Ibrahim, A.
Mohamed, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398977.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
61.05.C-
78.20.-e
Opis:
Nanocrystalline $Sn_{1-x}Fe_xO_2$ (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000°C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO₂ phase without extra peaks. The formation of a tetragonal rutile structure of SnO₂ nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO₂ nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1220-1225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binary Phase Diagram of Water/Brij58 Studied by SAXS
Autorzy:
Fall, S.
Pattier, B.
Benyayia, L.
Gibaud, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490051.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.-t
61.05.C-
64.70.dg
Opis:
The phase diagram of the binary water/Brij58 system has been studied at constant temperature T = 20°C first by simple optical observation and then by small angle X-ray scattering. The small angle X-ray scattering patterns in the isotropic diluted phase are analyzed in a quantitative way by refining the experimental measurements with a model assuming hard spherical micelles in interaction. The micelles are described by a poly dispersed core-shell model and the interaction by the Perkus-Yevick hard-sphere model. The fitted parameters are analyzed in detail to determine the way polyoxyethylene blocks are hydrated with respect to the volumic fraction of water. In the more concentrated regime, the crystalline phases that are identified are the Fm3m cubic, the 2D hexagonal and the lamellar phases. The structural parameters that describe each phases are analyzed and commented. The small angle X-ray scattering study is complemented by the determination of the temperature dependent liquid-solid transition by rheology.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 388-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Phase Transition in $CeCuAl_{3}$ Single Crystal
Autorzy:
Klicpera, M.
Javorský, P.
Daniš, S.
Brunátová, T.
Powiązania:
https://bibliotekanauki.pl/articles/1369117.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
65.40.G-
66.70.Df
Opis:
The high temperature properties of $CeCuAl_{3}$ single crystal were investigated by differential scanning calorimetry and high-temperature x-ray diffraction. The structural phase transition takes place around 300 °C. The phase transition changes the structural parameters only, the tetragonal $BaNiSn_{3}$-type structure is preserved. The significant changes of lattice parameters and especially atomic fraction coordinates with this transition are discussed with respect to the number of heating/cooling cycles and stability in time. Magnetic properties of as-cast and annealed sample are shown for comparison.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 290-291
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf $Bi_5Ti_3FeO_{15}$ Ceramic Powders Obtained by Mechanical Synthesis
Autorzy:
Dercz, G.
Rymarczyk, J.
Hanc, A.
Prusik, K.
Babilas, R.
Pająk, L.
Ilczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811608.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.Qr
61.05.C-
61.05.J-
81.07.Bc
81.20.Wk
Opis:
In this paper the structural and Mössbauer spectral properties of multiferroic ceramic $Bi_5Ti_3FeO_{15}$ powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of $Bi_2O_3$, $TiO_2$ and $Fe_2O_3$ powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1623-1629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickel/Zinc ratio and lanthanum substitution effect on structural and magnetic properties of nickel zinc ferrites
Autorzy:
Jančárik, V.
Šoka, M.
Ušáková, M.
Harťanský, R.
Powiązania:
https://bibliotekanauki.pl/articles/1053078.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Gg
75.30.Cr
61.05.C-
Opis:
Improvement of NiZn ferrites properties by means on Ni/Zn content ratio modification and by partial substitution of Fe³⁺ ions by La³⁺ ions is presented. Ni_{x}Zn_{1-x}Fe₂O₄ and Ni_{x}Zn_{1-x}La_{0.02}Fe_{1.98}O₄ samples of small particles were prepared by self-propagated combustion method. X-ray spectroscopy was used for structural analysis, temperature dependence of magnetic susceptibility was used for evaluation of chemical and phase composition. Analysis showed that pure spinel structure without secondary phase caused by La ions for all values of Ni/Zn content was present. Noticeable growth of the magnetic susceptibility at room temperature was observed with rising of Zn²⁺ ions content.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 693-695
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Doped YBCO Superconductor Crystal Structure Simulation
Autorzy:
Kavečanský, V.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1535386.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
74.62.Dh
74.72.-h
Opis:
Pinning process plays an important role in improving utility properties of $YBa_2Cu_3O_{7-δ}$ (YBCO) superconductors. As a consequence of the low coherent length, the most effective pinning centers in such type of materials should have nanometer size dimensions. An efficient way of introducing such centers can be a chemical substitution in the YBCO lattice. Computer simulation of locally distorted YBCO crystal structure due to the substitutions has been performed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1034-1035
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ellipsometric Evaluation of the Optical Constants of Zirconium Oxynitride Thin Films Deposited by Reactive Pulsed Magnetron Sputtering
Autorzy:
Tomsah, I.
Powiązania:
https://bibliotekanauki.pl/articles/1400496.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
61.05.C-
78.66.-w
Opis:
Three different zirconium oxynitride films were deposited onto glass and Si (100) substrates at room temperature by pulsed reactive dc magnetron sputtering of a metallic Zr target in an $Ar//O_2//N_2$ atmosphere. The structural, compositional and optical properties of the deposited films were found to depend on the ratio of nitrogen partial pressure to the total reactive gas partial pressure. Energy-dispersive X-ray spectroscopy measurements revealed that as the nitrogen amount increased in the reactive gas the nitrogen content was found to increase in the film. The film structure was determined by X-ray diffraction. The X-ray diffraction patterns of the analyzed samples revealed a strong dependence of the $ZrO_xN_{y}$ film structure on composition. A two layer model, the Bruggeman effective medium approximation and both Drude absorption edge and Lorentz oscillators were used to describe the surface roughness layer and the main $ZnO_xN_{y}$ layer, respectively, was used to describe the experimental ellipsometric data. The optical band gap was decreased from 3.56 to 3.45 eV with changing nitrogen content, while refractive index at 650 nm simultaneously was increased from 1.98 to 2.11.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 141-145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XRD study of Eu₂O₃-ZrO₂ feedstock powders and sintered materials
Autorzy:
Jucha, S.
Moskal, G.
Mikuśkiewicz, M.
Stopyra, M.
Powiązania:
https://bibliotekanauki.pl/articles/1153117.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
61.05.C-
77.84.Bw
Opis:
Presented article described synthesis process of nonstoichiometric europium zirconate by solid state reaction between weight-equal mixture of ZrO₂ and Eu₂O₃ feedstock powders. To final material synthesis high temperature vacuum press was used as well as a free standing process of sintering. As a result europium zirconates were obtained. X-ray diffraction characterization revealed that relatively homogeneous materials were synthesised but scanning electron microscopy analysis showed many areas with nonhomogeneous composition. On the base of X-ray diffraction patterns, characterization of crystallite size as well as a lattice strain were calculated. The Williamson-Hall, Halder-Wagner and Cauchy-Gauss methods were used to make the calculations. Obtained data showed that there was no significant differences between crystallite size with zirconate materials obtained by solid state reaction at temperature 1350°C in vacuum press and by free standing process. The short heating at higher temperature (1450°C/5 h) has no influence on crystallite size as well, but 24 h of additional heating strongly increases the crystallite size.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 866-868
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of topological point defects in graphitic layer - curvature effect and pair correlation function analysis
Autorzy:
Hawelek, L.
Powiązania:
https://bibliotekanauki.pl/articles/1075560.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.ue
61.72.J-
61.43.Bn
61.66.Fn
61.05.C-
Opis:
The effect of three types of topological defects, single vacancy, double vacancy and the Stone-Thrower-Wales defect on the atomic arrangement in a single graphitic layer is studied using computer simulations. The topological defects were positioned on the perfect hexagonal graphitic layer 20 Å in diameter with different distance from the layer edge and then the geometry of the system was independently optimized using the reactive bond order potential, the semi-empirical quantum-chemical PM7 and the density functional theory method. Curvature and the distortion of the graphitic layer caused by the defects are analyzed and their influence on the pair correlation function is discussed.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 811-816
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray diffraction and EBSD study of Al-Ti-Co-Ni-Fe high-entropy alloy
Autorzy:
Górecki, K.
Bała, P.
Cios, G.
Stępień, M.
Kozieł, T.
Wieczerzak, K.
Tokarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1153214.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.-t
61.05.C-
68.37.Hk
61.66.Dk
Opis:
Al₁₅Ti₂₀Co₂₀Ni₂₅Fe₂₀ alloy, synthesized in an arc furnace, was characterized by microscopic investigations, X-ray diffraction and electron backscatter diffraction techniques. Theoretical assumptions indicate a dual-phase crystal structure fcc+bcc. It was shown that dendrites and eutectic are bcc phase, and the interdendritic region is fcc phase.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 991-992
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Effect of Boron Concentration on Magnetic and Structural Properties of $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ Melt-Spun Alloys
Autorzy:
Siddique, M.
Ahmad, I.
Kanwal, M.
Ahmed, E.
Powiązania:
https://bibliotekanauki.pl/articles/1401887.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.-y
61.43.-j
61.05.C-
Opis:
The Mössbauer spectroscopy and X-ray diffraction techniques have been used to investigate the effect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ (x=6, 8, 10) produced by melt-spinning technique. X-ray diffraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diffraction patterns of samples heat-treated at 700°C are indexed as $Fe_{3}B,$ $\alpha-Fe,$ $(NdPr)_{2}Fe_{14}B$ and $Fe_{23}B_{6}$ phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are $(NdPr)_{2}Fe_{14}B$ hard and $t-Fe_{3}B$ soft magnetic phases while $\alpha-Fe$ and $Nd_{23}Fe_{6}$ are detected as minor phases. The average internal magnetic field decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diffraction and Mössbauer spectroscopy results are in good agreement with each other.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 353-357
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Study of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting
Autorzy:
Hawelek, L.
Wlodarczyk, P.
Zackiewicz, P.
Polak, M.
Kaminska, M.
Puźniak, R.
Radelytskyi, I.
Kolano-Burian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402326.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.30.Kz
61.05.C-
61.66.Fn
Opis:
Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 76-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Structure of $(NbSe_4)_3I$ and $(NbSe_4)_{10//3}I$ CDW Compounds at 14 K
Autorzy:
Zubko, M.
Kusz, J.
Prodan, A.
Bennett, J.
Świec, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398362.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ks
61.05.C-
72.15.Nj
61.72.Mm
61.66.-f
Opis:
Both $(NbSe_4)_3I$ and (NbSe_4)_{10//3}I$ compounds are interesting system possessing quasi one-dimensional linear chain character and exhibiting nonlinear transport properties with a second order phase transition. The compounds are built of $NbSe_4$ antiprisms, stacked along the tetragonal c axis into chains in a screw-like arrangement. Performed X-ray low temperature single crystal diffraction measurements allowed to solve, refine and analyze crystal structures of both compounds at 14 K. While $(NbSe_4)_{10//3}I$ compound undergoes structural phase transition to monoclinic phase, $(NbSe_4)_3 I$ remains in tetragonal symmetry. Iodine atoms are responsible for the differences in $(NbSe_4)_{10//3}I$ and $(NbSe_4)_3 I$ structures causing different spacing in the infinite $NbSe_4$ chains.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 869-872
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
Autorzy:
Xiao, X.
Xu, J.
Lu, B.
Cai, W.
Zhang, Y.
Shen, H.
Yang, B.
Xiang, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399369.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.05.C-
78.20.Ci
78.70.Ps
Opis:
The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 854-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Electrical Properties of Sintered Barium-Zinc-Titanate Ceramics
Autorzy:
Obradović, N.
Filipović, S.
Pavlović, V.
Paunović, V.
Mitrić, M.
Ristić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1503704.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Wk
81.20.Ev
61.05.C-
84.37.+q
Opis:
The aim of this work was an investigation of structural and electrical properties of sintered barium-zinc-titanate ceramics. Mixtures of $BaCO_{3},$ $ZnO$ and $TiO_{2}$ were mechanically activated in a planetary ball mill up to 80 minutes and sintered isothermally in air for 120 minutes at 1300°C. The phase composition in the $BaCO_{3}-ZnO-TiO_{2}$ system after milling and sintering was analyzed using the XRD method. The existence of pure barium-zinc-titanate has been registered. Microstructure analyses were performed using SEM. The results of electric resistivity, capacitance and loss tangent of the sintered samples were correlated with the XRD and SEM results.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 322-325
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Atomic Resolution to Molecular Giants: an Overview οf Crystallographic Studies of Biological Macromolecules with Synchrotron Radiation
Autorzy:
Jaskolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1538777.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.20.dk
61.05.C-
61.05.cp
61.68.+n
87.14.E-
87.18.Xr
Opis:
Protein crystals have huge unit cells ( ≈100 Å) filled not only with ordered protein molecules but also in about 50% with liquid water. The phase problem in protein crystallography can be solved by molecular replacement (using a suitable model molecule), by isomorphous replacement (using heavy atom derivatives), or by multiwavelength anomalous difraction (using resonant scattering of synchrotron-generated X-rays by anomalous atoms, such as Se). X-ray diffraction by protein crystals produces thousands of reflections but since the models are very complex (many thousands of atoms), paucity of data is a serious problem and stereochemical restraints are necessary. In consequence, the highest possible resolution (minimum d-spacing in Bragg's Equation) should always be the experimental goal. Protein structures determined by crystallography are deposited in protein data bank, which currently holds more than 62000 entries. Recent methodological advancements, stimulated by a wide-spread use of powerful synchrotron sources and by structural genomics, have resulted in rapid acceleration of the structure elucidation process, and in addition help to obtain a better data. Protein crystallography has produced atomic models of gigantic macromolecular assemblies, including the ribosome. It is also providing accurate targets for structure-guided development of drugs.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 257-263
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Application οf Al,Fe-Pillared Clays
Autorzy:
Banković, P.
Milutinović-Nikolić, A.
Jović-Jovičić, N.
Dostanić, J.
Čupić, Ž.
Lončarević, D.
Jovanović, D.
Powiązania:
https://bibliotekanauki.pl/articles/1808061.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.43.Gt
61.46.-w
68.43.-h
82.65.+r
Opis:
Al,Fe-pillared clay was synthesized from domestic clay from Bogovina according to a common procedure: grinding, sieving, Na exchange, pillaring, drying and calcination. Two synthesized samples differing only in calcining conditions were prepared. Phase composition and textural properties of the starting clay and synthesized pillared clays were characterized using X-ray diffraction and physisorption of nitrogen. Catalytic tests were performed using sample with better textural properties being the one submitted to milder calcining conditions. Catalytic wet peroxide oxidative degradation of aromatic compounds phenol and tartrazine on the synthesized catalyst was confirmed showing better efficiency in the case of tartrazine.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual stress in Cr₉₉Al₁ polycrystalline thin films
Autorzy:
Mudau, Z.
Sheppard, C.
Prinsloo, A.
Venter, A.
Ntsoane, T.
Fullerton, E.
Powiązania:
https://bibliotekanauki.pl/articles/1047677.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
68.47.De
75.30.Fv
75.50.Ee
Opis:
The magnetic phase diagram of bulk Cr_{100-x}Al_{x} shows interesting behaviour close to the triple point concentration of x ≈2. Since the magnetic properties of Cr are influenced by dimensionality, stress and strain, this study focussed on the investigation of Cr₉₉Al₁ thin films prepared on fused silica substrates with thicknesses t varying from 29 to 452 nm using sputtering techniques. Resistance measurements covering the temperature range 2 to 400 K did not show any clear anomalies that could be indicative of changes in the magnetic ordering. X-ray diffraction (XRD) and atomic force microscopy (AFM) studies indicate the films are polycrystalline textured and that the 80 nm sample has the smallest grain size. In-plane stresses in these thin films were studied using the specialised XRD ın²ψ-method. The results show that the stress varies with film thickness. The 29 nm sample has stress in the order of 833 MPa and with increasing film thickness the stress reaches 1471 MPa for the 80 nm layer, where after it systematically reduces for the thicker coatings to 925 MPa for the 452 nm film. The highest stress for the Cr₉₉Al₁ thickness sample series is seen in the film with the smallest grain size.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 578-581
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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