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Wyświetlanie 1-15 z 171
Tytuł:
Automation and Remote Synchrotron Data Collection
Autorzy:
Gilski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812241.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.Qe
61.05.cp
61.05.cf
Opis:
X-ray crystallography is the natural choice for macromolecular structure determination by virtue of its accuracy, speed, and potential for further speed gains, while synchrotron radiation is indispensable because of its intensity and tuneability. Good X-ray crystallographic diffraction patterns are essential and frequently this is achievable through using the few large synchrotrons located worldwide. Beamline time on these facilities have long queues, and increasing the efficiency of utilization of these facilities will help in expediting the structure determination process. Automation and remote data collection are therefore essential steps in ensuring that macromolecular structure determination becomes a very high throughput process.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 331-338
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granite Based Glass-Ceramic Materials
Autorzy:
Bayrak, G.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194689.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
62.20.-x
61.05.cp
Opis:
In this study, production possibility of glass and glass-ceramic produced from granite was investigated. The composition of granite based glass bath mixture was 50 wt% granite, 25 wt% dolomite and 25 wt% sodium carbonate. Composition that was grounded and mixed in a ball mill for 2 h was melted at 1500C for 1 h. Glass samples were heat treated for crystallization to produce glass-ceramic materials at 800°C, 900C and 1000C for 2 h to promote internal crystallization. Phase identifications of glass and glass-ceramic materials were investigated by X-ray diffraction analysis. Moreover, hardness and fracture toughness measurement of glass and glass-ceramic materials were applied. Granite based materials after that melting and casting process was found amorphous state by characterization with X-ray diffraction analysis. After the heat treatment processes, crystal phases settled out in glass matrix were also determined in granite based materials. Moreover, values of hardness and fracture toughness increasing were detected by heat treatment schedule.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 623-625
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat Study of $PrNi_4Si$
Autorzy:
Procházková, K.
Daniš, S.
Svoboda, P.
Powiązania:
https://bibliotekanauki.pl/articles/1813660.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
75.50.-y
Opis:
Here we present the results of pilot polycrystalline study of $PrNi_4Si$. The X-ray study did not confirm the expected $CaCu_5$-type structure. Instead of this, the orthorhombic structure with the space group Cmmm was found. The zero-field specific heat was measured in the temperature range 2-300 K. The data were analyzed using the sum of the phonon, electronic, and magnetic contributions to specific heat, respectively. The magnetic part of the specific heat can be well described using the Schottky formula for the 9 crystal-field singlet levels of the pz3 H4 ground-state multiplet of the $Pr^{3+}$ ion.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 299-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-Insulating Transition Metal-Doped III-V Materials
Autorzy:
Hennel, Andrzej M.
Powiązania:
https://bibliotekanauki.pl/articles/1877336.pdf
Data publikacji:
1991-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
72.80.Ey
81.60.Cp
Opis:
This review surveys the properties of transition metal (TM) doped semi-insulating (SI) III-V semiconductors. After a general definition of a SI material, a simple model of a SI crystal with a midgap donor and shallow impurities is discussed. A short history, main properties, and thermal stability problems of SI Cr-doped GaAs are presented. The puzzling problem of SI V-doped GaAs is explained. Several dopants (Cr, Fe, Co, and Ti) in SI InP are discussed in terms of the resistivities obtained, as well as thermal stability. Finally, GaP and GaInAs high resistivity systems are considered.
Źródło:
Acta Physica Polonica A; 1991, 79, 1; 15-29
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characterization of Some Table Salt Samples by XRD, ICP, FTIR and XRF Techniques
Autorzy:
Yalçin, Ş.
Mutlu, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1490744.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
Opis:
In this study, we have investigated structure and impurities of six different salts which have a great importance in our everyday life, namely source salt, Himalayan salt, rock salt, sea salt, lake salt and reduced sodium salt (minsalt) by means of different analytical methods, namely X-ray powder diffraction, scanning electron microscope-energy dispersive X-ray spectroscopy, inductive coupling plasma optic emission spectroscopy, X-ray fluorescence spectrometer and the Fourier transform infrared spectroscopy. With the light of obtained results, suitability and performance of the different analytical methods were discussed in some details.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 50-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manganites - Structural Aspects
Autorzy:
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1536851.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.05.F-
61.05.J-
75.30.kz
75.50.Ee
75.50.-y
Opis:
In the work a brief discussion of the structural and magnetic properties of the manganites from the point of view of the micro- and macrostructures is presented. The influence of stoichiometry with the different oxygen parameter δ and doped atoms is discussed. The correlation between the crystal structure parameters and magnetic properties for some manganites is presented.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 303-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isostructural Transition in RTAl Compounds at High Temperatures
Autorzy:
Prchal, J.
Javorský, P.
de Boer, F.
Moleman, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813676.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ks
61.05.cp
Opis:
Based on previously discovered forbidden values of the c/a ratio, we studied anomalies in the temperature evolution of the lattice parameters (a, c) of several hexagonal RTAl compounds at high temperatures (above room temperature). The compound $ErNi_{0.45}Cu_{0.55}Al$, that seemed to be impossible to be prepared in single-phase form, reaches the single-phase state at temperatures above 493 K (220°C). On the other hand, the compound $TbNi_{0.7}Cu_{0.3}Al$ - that was expected to undergo a first-order structural phase transition at high temperatures - exhibits a second-order type transition when approaching the critical values of the c/a ratio. These results are in agreement with idea of a forbidden range of c/a values in these compounds.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 335-338
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Raman Studies οf MgO/$SnO_2$ Core-Shell Heteronanowires
Autorzy:
Kim, H.
Powiązania:
https://bibliotekanauki.pl/articles/1807812.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.30.-j
61.05.cp
Opis:
We have reported the fabrication of MgO core/$SnO_2$ shell nanowires, by a two-step evaporation process. Thermal annealing induced changes in morphology, in which the nanowire surface became rough by the agglomeration of $SnO_2$ shell layers and its crystallinity was enhanced. It was found that three fundamental modes (475, 634, 772 $cm^{-1}$) and an infrared (IR)-active mode (682 $cm^{-1}$) of rutile $SnO_2$ appeared in the Raman spectrum of MgO core/$SnO_2$ shell nanowires. By thermal annealing, the relative intensity of the $A_{2u}$ to the $A_{1g}$ line was reduced, presumably due to the disorder or size effects.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 58-61
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Conductivity of Ce₂Ru₃Ga₉ Compound
Autorzy:
Falkowski, M.
Strydom, A.
Powiązania:
https://bibliotekanauki.pl/articles/1384860.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
63.20.kk
72.15.Eb
72.15.Jf
Opis:
The Ce-based 2:3:9 series of compounds are known for strongly correlated 4f-electron behaviour. Here, we report for the first time a study of the thermal conductivity κ(T) in zero and 9 T magnetic field for Ce₂Ru₃Ga₉ across the temperature range 2 K ≤ T ≤ 300 K. The zero-field temperature dependence of κ(T) exhibits a pronounced maximum, characteristic for metals with large electronic mean free path and towards room temperature κ(T) starts behaving in a manner usually attributed to the enhanced electron-phonon coupling. Based on the Wiedemann-Franz law the electronic and lattice contributions to the thermal conductivity were estimated. In high temperature region a distinct step-like anomaly at T* = 203 K has been observed which signals a putative phase transition, probably of phononic or lattice origin. We furthermore discuss the effect of applied magnetic fields on the thermal transport in Ce₂Ru₃Ga₉.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 240-242
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Ba-Doped PbS Thin Films Prepared by the SILAR Method
Autorzy:
Gülen, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1205230.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.-a
61.05.cp
68.55.Ln
Opis:
In this material production research, undoped and Ba-doped nanostructured PbS films are fabricated on glass surfaces by SILAR method. The structural, optical and morphological properties of the films are examined via scanning electron microscopy, UV-vis spectrophotometry and X-ray diffraction analysis. Scanning electron microscopy analysis revealed that Ba-doping concentration influences the size of the thin film's nanoparticles. X-ray diffraction results showed that all of the thin films are in a face centered cubic structure. Optical studies, in the room temperature, revealed that the optical band gap of the films increases as Ba-doping concentration is increased. The intercept values on the energy axis in the range of 1.86 eV and 2.12 eV for 1% and 8% Ba-doped PbS films respectively. As a result, it is concluded that the structural, optical and morphological properties of the fabricated thin films are directly depend on the Ba doping ratio.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 763-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The moment series expansion for quasicrystal with phason disorder
Autorzy:
Buganski, I.
Strzalka, R.
Wolny, J.
Powiązania:
https://bibliotekanauki.pl/articles/1112682.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
61.05.cp
61.43.-j
Opis:
The novel method for structural analysis of quasicrystals with phason flips is presented. The correction for diffraction peaks' intensities can be made within average unit cell approach by modification of the statistical distribution of atomic positions. Characteristic function of the distribution expanded into moment series, involving only even moments, estimates the envelope function and therefore the flip ratio can be evaluated.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 833-835
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin layers XRD study technique on an example of cobalt tetrafluoro phthalocyanine
Autorzy:
Sukhikh, A.
Basova, T.
Gromilov, S.
Powiązania:
https://bibliotekanauki.pl/articles/1075647.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
68.55.Nq
Opis:
Thin layers X-ray diffraction study technique utilizing single-crystal X-ray diffractometer equipped with microfocus X-ray tube is described. It is shown that the layers of the tetra-fluorinated cobalt phthalocyanine (CoPcF₄), deposited by thermal evaporation in vacuum on a polished surface of the substrate (glass, quartz), have a highly oriented polycrystalline structure. All the crystallites have the (00l) plane oriented along the surface of the substrate. CoPcF₄ X-ray diffraction pattern indexing was conducted and unit cell parameters were determined. It is shown that crystal phase of both polycrystalline powder and thin layers of CoPcF₄ are isostructural to that of α -CoPc.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 889-891
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetic Properties οf $Fe_{3-x}Ti_xSn$ Disordered Alloys
Autorzy:
Brzakalik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1811583.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
75.50.Bb
76.80.+y
Opis:
A series of $Fe_{3-x}Ti_xSn$ disordered alloys (where x = 0, 0.25, 0.5, and 0.75) obtained by arc-melting were studied. Directly after the melting all samples were mechanically crashed and in that form examined by the X-ray diffraction and Mössbauer effect methods. In $Fe_{3-x}Ti_xSn$ alloy with x = 0 three phases exist: FeSn (B35), $FeSn_2$ (C16) and Fe(Sn) (A2). The contributions of these phases decrease very fast in aid of ternary Fe-Ti-Sn alloys with the B2 and $D0_3$/$L2_1$ types of structure, as Ti atoms concentration increases. It was shown that these ternary alloys consist of four distinct Fe-Ti-Sn phases with contributions depending on the value of the x parameter. The value of hyperfine magnetic field $(B_{hf})$ parameter at the Fe nuclei is equal to about 110 kG for FeSn and $FeSn_2$ phases. However in alloys with A2, B2 and $D0_3$/$L2_1$ type of structure this value changes from 0 kG to 335 kG and can be considered (in the first approximation) as a function of Fe atoms number in the nearest neighborhood.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1529-1536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of atoms arrangement in Zr-based bulk metallic glass structure
Autorzy:
Pilarczyk, W.
Podwórny, J.
Powiązania:
https://bibliotekanauki.pl/articles/1065200.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.25.Mv
61.43.Dq
Opis:
Zr-Cu-Ni-Al bulk metallic glass is an attractive alloy system for scientific research and engineering applications. Alloys from this system exhibit high strength, hardness, corrosion resistance and good glass forming ability which makes them useful in many applications. In order to successfully apply amorphous materials, it is necessary to characterize their structure and properties, which are mutually dependent. The mechanical properties of the Zr-based amorphous alloy are the result of its unique, disordered structure. In this experiment, amorphous alloy of desirable composition in the form of a plate with thickness of 2 mm was prepared by melting high purity Zr, Cu, Ni, Al elements and casting into a copper mould by applying an ejection pressure. The amorphousness of rapidly solidified Zr₅₅Cu₃₀Ni₅Al₁₀ plate was examined by X-ray diffraction and microscopic observation. These investigations revealed that the studied Zr-based sample was amorphous. Based on experimental X-ray data the pair distribution function was calculated and discussion on possible atoms arrangement was carried out.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 216-218
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The law of growth of nitrided layer in 31CrMoV9 steel
Autorzy:
Syla, N.
Aliaj, F.
Dalipi, B.
Powiązania:
https://bibliotekanauki.pl/articles/1068250.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
81.65.Lp
Opis:
The law of growth of nitrided layers produced by gaseous nitriding of 31CrMoV9 alloy steel at different process parameters is described. 31CrMoV9 steel specimens were subjected to nitriding process in ammonia gas at three different temperatures: 510, 550 and 590°C, and for each temperature four different nitriding times were used. This way twelve specimens were produced. Nitrided specimens were investigated with optical microscopy, electron probe micro-analysis and x-ray diffraction. The nitrogen depth concentration profiles, deduced from electron probe micro-analysis, in conjunction with results of optical microscopy, were used to determine the thickness of the nitrided layers, i.e. the diffusion depth of nitrogen. From the dependence of the nitrided layer thickness on process parameters (temperature and time) it was possible to deduce the law that governs the growth of the nitrided layer for 31CrMoV9 alloy steel. Through this law, then, it is possible to predetermine the layer thickness for every real process parameter in nitriding of 31CrMoV9 steel, which is very important for technological applications.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 83-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 171

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