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Wyświetlanie 1-15 z 19
Tytuł:
Stiffness of Auxetic Foams
Autorzy:
Więcek, T.
Wasilewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032450.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.dq
Opis:
An optical method is used for measurements of mechanical properties of foams. The method is based on analysis of diffraction pattern and does not require calibration. The measurements of the stiffness were performed for the conventional and auxetic foams. It was found that the stiffness of auxetic foams is several times greater than that of conventional foams.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 182-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Pressure Induced B1-B2 Phase Transition of CdO
Autorzy:
Bhardwaj, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399274.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
62.20.dq
62.50.-p
Opis:
In this paper, the structural, elastic and thermodynamic properties of CdO under different pressure range have been reported. An extended interaction potential model (including the zero point energy effect) has been used for this study. Phase transition pressures are associated with a sudden collapse in volume. At compressed volume, the present oxide is found in cesium chloride (CsCl) phase. The calculated second order elastic constants and their various combinations have been reported in different pressure range. The calculated values have been compared with available results. Our values have been found in good agreement with existing findings.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 677-684
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Study of Transition Metal Carbides
Autorzy:
Bhardwaj, P.
Powiązania:
https://bibliotekanauki.pl/articles/1419783.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
62.20.dq
62.50.-p
Opis:
In this research paper we have discovered the structural phase transition and elastic properties of transition metal carbides (TaC and HfC). Phase transition pressures are associated with a sudden collapse in volume showing the incidence of first order phase transition. At ambient condition the present compounds exhibit rock salt (NaCl) structure, they transform into cesium chloride (CsCl) structure under high pressure. The phase transition pressures and associated volume collapses obtained from present potential model show a generally good agreement with the available literature. The elastic constants and bulk modulus are also reported for the present compounds.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 138-141
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Potential Superhard Phase of $OsN_2$
Autorzy:
Fan, Q.
Wei, Q.
Yan, H.
Zhang, M.
Zhang, D.
Zhang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1205218.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
65.40.-b
62.20.dq
Opis:
A new phase of C2/m $OsN_2$ is proposed in this paper. The crystal structure, elasticity and electronic properties of C2/m $OsN_2$ were studied by first-principles calculations. The elastic constants, the elastic moduli (B, G, and E) and Poisson's ratio v of $OsN_2$ have been investigated. From the first-principles calculations, we find that C2/m $OsN_2$ is metallic and mechanically stable. The quasi-harmonic Debye model, using a set of total energy versus molar volume obtained from the first-principles calculations, is applied to the study of the thermal and vibrational effects. The dependence of structural parameters, thermal expansions, heat capacities, Grüneisen parameters and Debye temperatures on the temperature and pressure are obtained in the whole pressure range from 0 to 80 GPa and temperature range from 0 to 800 K as well as compared with available data.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 740-746
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First-principles calculations on phase transition and elastic properties of CoN
Autorzy:
De-Chun, He
Yong, Peng
Su-Yuan, Li
Yong-Lin, He
Powiązania:
https://bibliotekanauki.pl/articles/1075580.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.de
62.50.-p
62.20.dq
Opis:
The structural phase transition and elastic properties of CoN are investigated by ab initio plane-wave pseudopotential density function theory method. The equilibrium lattice parameters a₀, elastic constants C_{ij}, bulk modulus B₀ and its derivative B'₀ are calculated. From the usual condition of equal enthalpy, the phase transition of CoN from zinc-blende to rocksalt structure occurs at 35.4 GPa with a volume collapse of about 15.6%, consistent with the calculated result 36 GPa (FP-LDA), but an uncertainty is about 4.4 GPa compared with the 31 GPa (ASA-GGA). All three independent elastic constants, C₁₁, C₁₂, and C₄₄ for CoN are calculated from direct computation of stresses generated by small strains. Both C₁₂ and C₄₄ are less sensitive to pressure as compared with C₁₁. The calculated conclusions offer theoretical data for the further research of the mechanical properties for CoN.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 743-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Order Parameters Coupling in Uniaxial Ferroelectrics on the Basis of Pyroelectric and Dilatometric Measurements
Autorzy:
Gałązka, M.
Zieliński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1538260.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.10.+h
64.60.Bd
62.20.dq
Opis:
A method is devised of extracting the explicit form of the coupling between the primary and secondary order parameters with the use of experimental data and respecting classical and non-classical values of the effective critical exponents. The corresponding equation of state stems from the Ising model on a compressible lattice treated within the mean field approximation supplemented with terms ascertaining scaling invariance in the vicinity of the critical point. The theory is exemplified by the molecular ferroelectric crystals ($CH_{3}NH_{3})_{5}Bi_{2}Cl_{11}$ (MAPCB) and ($CH_{3}NH_{3})_{5}Bi_{2}Br_{11}$ (MAPBB).
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 566-569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Stability of Amorphous Alloy of Modified Finemet Type
Autorzy:
Huráková, M.
Csach, K.
Juríková, A.
Miškuf, J.
Rajňák, M.
Ďurišin, M.
Kvačkaj, T.
Powiązania:
https://bibliotekanauki.pl/articles/1387067.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
62.20.de
Opis:
The Finemet type amorphous alloys are well known as high frequency soft magnetic materials. They have good soft magnetic properties which are characterized by low coercive force and high permeability because of the lack of crystalline anisotropy. The structural stability of the amorphous ribbon of Finemet type modified by Mn, Al and Cr prepared by melt-spinning process was studied using differential scanning calorimetry and dynamical mechanical analysis. With increase of the crystalline portion in the sample, the Curie transition is shifted to the higher temperatures. The magnetic relaxation processes at frequencies above 10⁴ Hz were detected by mass magnetic susceptibility measurement.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 564-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Plastic Deformation on Nanocrystallization of Finemet Alloy
Autorzy:
Csach, K.
Miškuf, J.
Juríková, A.
Janák, G.
Powiązania:
https://bibliotekanauki.pl/articles/1534051.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The Finemet alloy prepared by the crystallization of an amorphous precursor is a basic model material for study of magnetic nanoparticle structures. Intensive plastic deformation localized in adiabatic shear bands causes the intensive heating and structural changes in the amorphous alloy. These changes influence the magnetic properties of the amorphous precursor for the Finemet crystallization.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 820-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Plastic Deformation on Devitrification of $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ Amorphous Alloy
Autorzy:
Csach, K.
Miškuf, J.
Juríková, A.
Powiązania:
https://bibliotekanauki.pl/articles/1367306.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The method of thermogravimetry in external magnetic field was modified using square wave alternate magnetic field for an estimation of the temperature dependence of the magnetization. This method was used for the study of influence of plastic deformation of the amorphous alloy $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ on the structural changes.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 98-99
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Relaxation of Ni-Si-B Amorphous Ribbon
Autorzy:
Juríková, A.
Csach, K.
Miškuf, J.
Ocelík, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813536.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The structural relaxation of the Ni-Si-B amorphous ribbon was studied by means of differential scanning calorimetry and thermomechanical analysis. It was shown that considerable length changes associated with reversible structural relaxation were revealed after a previous creep applied at higher temperatures.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 99-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys
Autorzy:
Miškuf, J.
Csach, K.
Juríková, A.
Powiązania:
https://bibliotekanauki.pl/articles/1428973.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The influence of the intensive plastic deformation on the structure of ferromagnetic amorphous alloys has been studied by means of thermoanalytical methods. It was shown that the work of plastic deformation led to the local heating in thin shear band layers and the dissipation of the energy caused structural changes in the region outside these bands. The plastic deformation influences the structure of the alloys and their structural sensitive magnetic properties.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1273-1275
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Failure of $Al_{90}Fe_7Ta_3$ Amorphous Alloys
Autorzy:
Miškuf, J.
Csach, K.
Juríková, A.
Bengus, V.
Tabachnikova, E.
Shumilin, S.
Podolskiy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1534053.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.mm
Opis:
The fractographic analysis was used for the interpretation of ultra-low temperature dependences of yield or fracture stress. Analysis of fracture morphology revealed that dominantly chevron morphology is present and that the failure of this amorphous material initiates at low temperatures at geometrical imperfections of ribbons and these failures are often presented as a premature failure.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 823-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creep Behaviour of Co-Based Amorphous Alloys
Autorzy:
Csach, K.
Miškuf, J.
Juríková, A.
Vojtaník, P.
Powiązania:
https://bibliotekanauki.pl/articles/1813534.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The detailed study of the temperature dependence of the viscosity of (Co, Fe)-(Si, B) amorphous metallic alloys up to crystallization temperatures was carried out. The kinetics of the non-equilibrium viscosity was described using Vogel-Fulcher-Tammann law below the glass transition temperature.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 91-94
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Changes in Deformed Soft Magnetic Ni-Based Metallic Glass
Autorzy:
Juríková, A.
Csach, K.
Miškuf, J.
Ocelík, V.
Powiązania:
https://bibliotekanauki.pl/articles/1810607.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
62.20.Hg
Opis:
The effects of intensive plastic deformation of the soft magnetic metallic glass Ni-Si-B on the structural relaxation were examined. The enthalpy changes studied by differential scanning calorimetry revealed that the intensive plastic deformation was associated with the partial structural relaxation of the amorphous structure.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 393-395
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poisson Ratio and Biaxial Relaxation Coefficient in $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ Alloys
Autorzy:
Łepkowski, S.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/1492915.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
61.43.Dq
81.40.Jj
Opis:
We present theoretical results showing dependence of Poisson ratio and biaxial relaxation coefficient on composition and atomic arrangement in wurtzite $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys. Our calculations reveal that the Poisson ratio determined for $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys subjected to a uniaxial stress parallel to the c axis of the wurtzite structure shows significant superlinear dependence on composition. The superlinear bowing in Poisson ratio is enlarged by the effect of In clustering. The biaxial relaxation coefficient determined for $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys subjected to a biaxial stress in the plane perpendicular to the c axis of the wurtzite structure changes superlinearly and linearly with x in $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$, respectively. The effect of In atom clustering results in sublinear dependence of the biaxial relaxation coefficient in both $In_{x}Ga_{1-x}N$ and $In_{x}Al_{1-x}N$ alloys.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 902-904
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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