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    Wyświetlanie 1-15 z 15
    Tytuł:
    Nanocrystalline and Polycrystalline Phases Present in the Protective Metalloceramic Coatings
    Autorzy:
    Górski, L.
    Pawłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035503.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Ks
    81.30.-t
    Opis:
    New data about the structure of high-temperature resistant metalloceramic plasma sprayed coatings in micro and nano areas are presented. Application of the new instrumental methods: transmission electron microscopy combined with selected area electron diffraction made it possible to obtain these data. The first layer in Ni based metallic bondcoat shows nanocrystalline structure. External ceramic layer based on stabilised ZrO$\text{}_{2}$ is polycrystalline and contains both cubic and tetragonal crystalline phases. Local inhomogeneities in coatings phase composition are determined.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 295-299
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Diffraction and Electron Microscopy Studies on the Structure of Thermal Barrier Coatings
    Autorzy:
    Górski, L.
    Pawłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419613.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Ks
    81.30.-t
    Opis:
    Composites based on $Al_2O_3$ and $ZrO_2$ are used. Coatings deposited by plasma spraying technology are studied with the use of X-ray diffraction and electron microscopy combined with electron diffraction methods. Phase transitions and specific coatings layered microstructure with local fluctuations of phase and chemical composition are connected with the conditions of plasma spray process.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 405-409
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Resistance and Phase Transitions Studies for Some composite Materials Based on Al$\text{}_{2}$O$\text{}_{3}$
    Autorzy:
    Górski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011028.pdf
    Data publikacji:
    1999-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Ks
    81.30.-t
    Opis:
    In this paper the studies of phase transitions in some material compositions based on Al$\text{}_{2}$O$\text{}_{3}$ caused by high-temperature processes are presented. These material compositions may be used to high-temperature resistant plasma sprayed coatings. The occurring phase transitions are studied by X-ray diffraction methods. Phase transitions and thermal resistance for studied oxide systems are different. In the coatings from the materials belonging to Al$\text{}_{2}$O$\text{}_{3}$-NiO and Al$\text{}_{2}$O$\text{}_{3}$- ZrO$\text{}_{2}$ systems complex phase transitions were observed. More resistant to the conditions of thermal fatigue are coatings containing aluminum titanate Al$\text{}_{2}$TiO$\text{}_{5}$ and mullite 3 Al$\text{}_{2}$O$\text{}_{3}$-2 SiO$\text{}_{2}$.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 2; 275-281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of the Unstable Mixing Region in $Zn_{1-x}Cd_xO$ Ternary Alloys
    Autorzy:
    Shtepliuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399136.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.75.-g
    81.30.-t
    81.30.Bx
    Opis:
    The $Zn_{1-x}Cd_xO$ ternary alloys with a narrow band gap, which are useful for light emitters in the visible wavelengths, are studied with respect to the unsteady region in mixing. This unstable region in mixing is calculated from the free energy of mixing using the strictly regular solution model. The interaction parameter used in this calculation is obtained by means of the valence-force-field model. An influence of the strain energy induced by substrate on the region of the spinodal decomposition for the $Zn_{1-x}Cd_xO$ system is studied and discussed.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 865-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Al/Steel Bimetal Composite Fabrication by Vacuum Assisted Solid Mould Investment Casting
    Autorzy:
    Guler, K.
    Kisasoz, A.
    Karaaslan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1377846.pdf
    Data publikacji:
    2014-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.30.Fb
    81.30.-t
    81.20.-n
    Opis:
    Bimetal composites are a group of promising engineering materials with high developing and service potential. Especially in many fields they can be a powerful low cost alternative to metal-ceramic composites. The most commonly encountered type of these composites is steel reinforced aluminium matrix composites which stand out with high wear and abrasion resistance. Significant fabrication processes of metal/metal composites are based on liquid metal techniques. In this study, Al/steel composite specimens were produced by using vacuum assisted solid mould investment casting technique. A7075 wrought aluminium alloy were infiltrated into steel preforms, which were produced with 304 stainless steel and H13 hot-work tool steel turnings, in the plaster based solid investment casting moulds. Microstructure observations, HV microhardness measurements, scanning electron microscopy and energy dispersive X-ray spectroscopy analysis were carried out for characterization.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 6; 1327-1330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals
    Autorzy:
    Bunda, V.
    Bunda, S.
    Vashchuk, F.
    Feher, A.
    Kajňaková, M.
    Kováč, J.
    Syrkin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535538.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.K-
    81.30.-t
    65.40.-b
    Opis:
    We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures $T_{c1}$ = 167.5 K and $T_{c2}$ = 214.6 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1069-1070
    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:
    Growth and Investigation of $Nd_{1-x}Sm_{x}ScO_3$ and $Sm_{1-x}Gd_{x}ScO_3$ Solid-Solution Single Crystals
    Autorzy:
    Uecker, R.
    Klimm, D.
    Bertram, R.
    Bernhagen, M.
    Schulze-Jonack, I.
    Brützam, M.
    Kwasniewski, A.
    Gesing, Th.
    Schlom, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399463.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.75.Nx
    81.10.Fq
    81.30.-t
    Opis:
    The pseudo-cubic lattice parameters of rare-earth (RE) scandate, $REScO_3$, single crystals grown by the Czochralski technique with RE = Dy to Pr lie between about 3.95 and 4.02 Å. These crystals are the only available perovskite substrates in this lattice constant range that can withstand virtually any thin film growth conditions. Two members of this series, $PmScO_3$ and $EuScO_3$, are, however, not suitable for substrate applications. Because the pseudo-cubic lattice parameters between neighbouring $REScO_3$ compounds decrease with rising atomic number of the RE in about 0.01 Å steps, the unsuitability of $PmScO_3$ (radioactivity) and $EuScO_3$ (incompatibility with Si) causes an interruption in this lattice spacing sequence. To replace them, solid solutions of their adjacent rare-earth scandates, i.e., $(Nd_{0.5}Sm_{0.5})ScO_3$ and $(Sm_{0.5}Gd_{0.5})ScO_3$, were grown by the Czochralski method. Their average pseudo-cubic lattice parameters of 3.9979 Å and 3.9784 Å are very close to those of $PmScO_3$ and $EuScO_3$, respectively, and they show very low segregation. These qualities make these solid solutions excellent substitutes for $PmScO_3$ and $EuScO_3$.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 295-300
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Feederless Casting Limits by Thermal Analysis in Cast Iron
    Autorzy:
    Erturk, S.
    Kumruoglu, L.
    Ozel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030308.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.30.-t
    81.30.Fb
    81.70.Pg
    Opis:
    In this study the determinations of melt quality was carried out by thermal analysis of ductile iron. The aim of the study was to determine the limits of feederless casting after the determination of inoculation quality in cast iron. Production method of pouring into a sand mold in the entirety and without using feeder systems has been investigated. Forms of the solidification and volume change have been investigated with simulation program as functions of inoculation quality, type of resin in the mold and mold rigidity. Results of the analysis have been compared with the results of experimental iron casting.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 370-373
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Thermomagnetic Properties of As-Quenched Gd₇₅Ge₁₅Si₅Pr₅ Alloy
    Autorzy:
    Hasiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030838.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Cc
    81.30.-t
    75.60.Ej
    75.30.Cr
    65.40.Ba
    Opis:
    Microstructure and thermomagnetic properties of the as-quenched Gd₇₅Ge₁₅Si₅Pr₅ (wt.%) alloy are studied. Multiphase composition of the investigated sample was confirmed by microstructural as well as magnetic investigations. The presence of the Gd₆₈Ge₁₈Si₇Pr₇ and Gd₇₆Ge₁₄Si₅Pr₅ regions with different atom concentration was confirmed by SEM/EDS analysis and temperature dependence of magnetic mass susceptibility. From DC magnetic measurements of magnetization versus temperature performed in zero-field/field cooled modes, and magnetic mass susceptibility investigations the Curie temperature (283 K and 278 K, respectively) and magnetic behavior were studied. Moreover, the structural investigations were performed as temperature dependence of specific heat capacity.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 684-687
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ZrO₂ Addition on the Structure and Dielectric Properties of BaTiO₃ Ceramics
    Autorzy:
    Oksuz, K.
    Sen, S.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032539.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.50.-n
    77.84.-s
    82.45.Xy
    81.30.-t
    Opis:
    Ba(Ti_{1-x}Zr_{x})O₃ (x=0÷0.3) ceramics were prepared by the standard solid state reaction method and were sintered at 1450°C for 4 h. The structural and dielectric properties of the samples were studied. The phases formed in the ZrO₂ doped BaTiO₃ were tetragonal and of cubic symmetry. Increase in ZrO₂ content in the BaTiO₃ caused to increase of the lattice parameter and crystallite size of the perovskite structure. The evolution of the Raman spectra was studied for various compositions and the spectroscopic signature of the corresponding phase was determined. The scanning electron microscope was used to investigate the microstructure and surface morphology of the sintered samples. Scanning electron microscope observations revealed enhanced microstructural uniformity and retarded grain growth with increase of ZrO₂ content. Dielectric characteristics of ZrO₂ doped barium titanate were studied using a Hioki 3532-50 LCR meter in the frequency range of 1 kHz-1 MHz. It is found that the dielectric constant (ε_{r}) increases while the dielectric loss (tan δ) decreases with increase in zirconium oxide content (x<0.3).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 197-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic and Magnetic Effects on Cu Doping $Ti_2NiAl$ Heusler Alloy: A First-Principles Study
    Autorzy:
    Wei, X.
    Chu, Y.
    Sun, X.
    E, Y.
    Song, T.
    Guo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205451.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Gj
    61.72.S-
    81.30.-t
    75.50.Cc
    Opis:
    We investigate the effect of the electronic and magnetic properties on nonmagnetic Cu-3d atoms doping the Heusler alloy $Ti_2Ni_{1-x}Cu_xAl$ $(0 ≤ x ≤ 1)$ using first-principles calculations. The optimized lattice constants are consistent with the Vegard law, and energies of doped systems become more lower as the increase of x concentration. A critical transition diagram from half-metallic to metallic characters is discussed. In addition, the magnetic interactions between p and d states are illustrated. Finally, magnetic moments are given as a function of x value, which implies that the Slater-Pauling rule is obeyed at low Cu content $(x ≤ 0.2)$.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 795-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Dispersion Analysis as an Indispensable Tool for Predictions of Solid State Polymorphism and Dynamic Metastability: Case of Compressed Silane
    Autorzy:
    Kurzydłowski, D.
    Grochala, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505181.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Vw
    63.20.dk
    64.70.K-
    81.30.-t
    Opis:
    Diamond anvil cell experiments suggest that upon compression above 26.5 GPa silane $(SiH_4)$ forms a polymeric phase VI, whose crystal structure has not yet been solved. Here we present DFT calculations showing how phonon-guided optimization leads to a polymeric Fdd2 structure which is the lowest-enthalpy polymorph of $SiH_4$ above 26.8 GPa, and which most probably can be identified as the experimentally observed polymeric phase. The new algorithm of predicting the lowest-energy structures enables simultaneous inspection of the potential energy surface of a given system, calculation of its vibrational properties, and assessment of chances for obtaining a metastable ambient-pressure structure via decompression. Our calculations indicate that at room temperature the differences in the vibrational and entropy terms contributing to the Gibbs free energy of different polymorphs of silane are negligible in comparison with corresponding differences in the zero-point energy corrections, in contrast to earlier suggestions. We also show that the Fdd2 polymorph should be metastable upon decompression up to 5 GPa, which suggests the possibility of obtaining a polymeric ambient-pressure form of $SiH_4$. Polymeric silane should exhibit facile thermal decomposition with evolution of molecular hydrogen and thus constitute an efficient (12.5 wt%) material for hydrogen storage.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 895-900
    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:
    Characterization of Rapidly Solidified $Al_{65}Cu_{20}Fe_{15}$ Alloy in Form of Powder or Ribbon
    Autorzy:
    Lityńska-Dobrzyńska, L.
    Dutkiewicz, J.
    Stan-Głowińska, K.
    Dembinski, L.
    Coddet, C.
    Ochin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373231.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.30.-t
    61.44.Br
    61.05.cp
    61.05.jm
    Opis:
    The $Al_{65}Cu_{20}Fe_{15}$ alloy has been prepared by conventional casting to the mould and by melt spinning or atomisation techniques. The melt spun ribbon was in the form of fragmented, brittle flakes, atomized powder has spherical shape with average size 17.2 μm. It was found that icosahedral I-phase was the main phase in all types of prepared samples. In the conventionally cast alloy the following phases have been identified additionally: $λ-Al_{13}Fe_4$, τ-AlCu(Fe) and $η_2-AlCu$. In the melt-spun ribbon the formation of $η_2$ is avoided, while in the atomised powder the I-phase coexists with small amount of copper rich τ-phase. In the cast ingot the I-phase form as a product of peritectic reaction λ + L, while in the ribbon and in the powder quasicrystal solidified from the undercooled melt as primary phase and next metastable cubic τ-AlCu(Fe) was formed at the interdendritic areas. Single I-phase grains of the sizes about 1 μm are observed in the ribbon close to the wheel side.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 512-515
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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