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Wyświetlanie 1-15 z 22
Tytuł:
Temperature Dependent Anharmonic Properties of Lead Chalcogenides
Autorzy:
Raju, K.
Powiązania:
https://bibliotekanauki.pl/articles/1535668.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.D-
81.40.Jj
Opis:
Calculations were made to investigate the anharmonic properties of lead chalcogenides PbS, PbSe and PbTe at elevated temperatures by means of primary physical parameters viz. nearest-neighbour distance and hardness parameter using long- and short-range potentials. Higher-order elastic constants are computed up to their melting temperature for these crystals. The first order pressure derivatives of second- and third-order elastic constants, the second-order pressure derivatives of second-order elastic constants and partial contractions are also evaluated at different temperatures. As the experimental elastic constants are not available at high temperatures, hence our results were only compared with the available values obtained at room temperature. The nature of the elastic behaviour in these compounds was analyzed.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 600-605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of the Light Emission in Zinc-Blende InGaAs/GaAs and InGaN/GaN Quantum Wells
Autorzy:
Łepkowski, S.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/1791301.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.D-
62.50.-p
81.40.Jj
78.67.De
Opis:
We present theoretical study of the pressure coefficient of the light emission $(dE_{E}/dP)$ in compressively strained zinc-blende InGaAs/GaAs and InGaN/GaN quantum wells, grown in a (001) direction. We investigate the contributions to $dE_{E}$/dP arising from (i) third-order (nonlinear) elasticity, (ii) nonlinear elasticity, originating from pressure dependence of elastic constants, and (iii) nonlinear dependence of elastic constants on composition in InGaAs and InGaN alloys. The obtained results indicate that the use of nonlinear elasticity is essential for determination of $dE_{E}$/dP in the strained InGaAs/GaAs and InGaN/GaN quantum wells, while the inclusion of the nonlinear dependence of elastic constants on composition of InGaAs and InGaN alloys does not improve agreement between the theoretical end experimental values of $dE_{E}$/dP in the considered structures.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 857-858
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
Tytuł:
Optimized Temperature in Phosphorous Diffusion Gettering Setup of Chromium Transition Metal in Solar Grade Multicrystalline p-Type Silicon Wafer
Autorzy:
Bouhafs, D.
Khelifati, N.
Kouhlane, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1398753.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.40.jj
81.05.Bx
81.65.Tx
87.15.Pc
Opis:
We have investigated in this work the effect of the temperature profile during homogeneous phosphorous diffusion gettering (PDG) on multicrystalline (mc-Si) silicon p-type wafers destined for photovoltaic solar cells. Temperatures were varied from 800°C to 950°C with time cycle of 90 minutes. Phosphorous profile of n⁺p junction was measured by secondary ion mass spectroscopy (SIMS) from 0.45 μm to 2.4 μm. Chromium concentration profile measured on the same samples by SIMS shows a high accumulated concentration of Cr atoms in the gettering layer at 900°C and 950°C, compared to samples obtained at 800°C and 850°C. The effective lifetime $(\tau_\text{eff})$ of minority charge carriers characterized by quasi-steady state photoconductance (QSSPC) is in correlation with these results. From the QSSPC measurements we have observed an amelioration of $\tau_\text{eff}$ from 7 μs before PDG to 26 μs in the samples after PDG, processed at 900°C. This indicates the extraction of a non-negligible concentration (5×10¹⁴ cm¯³ to 5×10¹⁵ cm¯³) of Cr from the bulk to the surface gettering layer, as observed in the chromium SIMS profiles. A light degradation of $\tau_\text{eff}$ (18 μs) is observed in the samples treated at 950°C due probably to a partial dissolution of the metallic precipitates, especially at the grain boundaries and in the dislocations vicinity. The related $\tau_\text{Cr-Impurity}$ lifetime value of about 8.5 μs is extracted, which is the result of interstitial $Cr_{i}$ or $Cr_{i}B_{s}$ pairs, proving their strongest recombination activity in silicon.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 690-693
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Control Problem for a Conformable Fractional Heat Conduction Equation
Autorzy:
Iskender Eroğlu, B.
Avci, D.
Özdemir, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031263.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.10.+i
02.30.Yy
02.60.Cb
81.40.Jj
Opis:
This paper presents an optimal boundary temperature control of thermal stresses in a plate, based on time-conformable fractional heat conduction equation. The aim is to find the boundary temperature that takes thermal stress under control. The fractional Laplace and finite Fourier sine transforms are used to obtain the fundamental solution. Then the optimal control is held by successive iterations. Numerical results are depicted by plots produced by MATLAB codes.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 658-662
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroscopic and Microscopic Descriptions of the Plastic Deformation of Fcc Metals over a Wide Range of Strain and Temperature
Autorzy:
Csanádi, T.
Chinh, N.
Gubicza, J.
Langdon, T.
Powiązania:
https://bibliotekanauki.pl/articles/1419113.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Bi
83.50.Uv
65.40.-b
81.40.Jj
61.72.Cc
Opis:
The plastic behavior of face-centered cubic metals was investigated over a wide range of strain and testing temperature. The experimental stress-strain data were described using both macroscopic and microscopic, well-established relationships. The characteristics of these descriptions are discussed and compared with each other. The analysis of the characteristics leads to a definition of the low and high temperature deformation regions, where the kinetics of both the dislocation-multiplication and the dislocation-annihilation (recovery) are different. For pure aluminum, it is shown that the boundary between these two regions occurs at a homologous temperature of the order of $\approx 0.5 T_{m}$ where $T_{m}$ is the absolute melting temperature. From this analysis, correlations are also drawn between the macroscopic parameters describing the stress-strain relationship and the fundamental characteristics of the microscopic processes both at room temperature and elevated temperatures.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 630-633
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Pseudoelastic Behaviour and Surface Characteristics of N Ion Implanted NiTi Shape Memory Alloy
Autorzy:
Levintant-Zayonts, N.
Kwiatkowski, L.
Swiatek, Z.
Brzozowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030131.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
81.40.Jj
61.72.U-
61.72.-y
Opis:
The main goal of the proposed paper is to present the results of the nitrogen ion implantation effects on mechanical and corrosion properties of NiTi shape memory alloy. Local pseudoelasticity phenomena of NiTi were determined using the ultra-low load applied system. The load-penetration depth curves show that lower nitrogen fluence improves mechanical properties in the near surface layer but higher ion fluence leads to degradation of pseudoelasticity properties. Corrosion resistance of NiTi in the Ringer solution was evaluated by means of electrochemical methods. The results of potentiodynamic measurements in the anodic range for implanted NiTi indicate a decrease of passive current density range in comparison with non-treated NiTi, without any signs related to Ni release. The results of impedance measurements recorded at the corrosion potential show a capacitive behaviour for all samples without clear predominance of one of them. It can be explained by the fact that this result concerns the first stage of corrosion exposition. It is shown that nitrogen ion implantation leads to formation of modified surface of improved physicochemical properties.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 210-216
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF₂ Nanocomposite Films
Autorzy:
Kasiuk, J.
Fedotova, J.
Przewoznik, J.
Kapusta, Cz.
Skuratov, V.
Milosavljevic, M.
Bondariev, V.
Koltunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402191.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.30.Gw
81.15.Jj
81.40.Wx
81.40.Rs
61.80.Jh
Opis:
The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF₂ irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 828-831
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion Irradiation of Oxidized FeCoZr-CaF₂ Nanocomposite Films for Perpendicular Magnetic Anisotropy Enhancement
Autorzy:
Kasiuk, J.
Fedotova, J.
Przewoźnik, J.
Kapusta, C.
Skuratov, V.
Svito, I.
Bondariev, V.
Kołtunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1030130.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.30.Gw
81.15.Jj
81.40.Wx
81.40.Rs
61.80.Jh
Opis:
The paper is focused on the results of Xe ions irradiation of nanocomposite FeCoZr-CaF₂ films synthesized in the oxygen-containing atmosphere. Combined influence of nanoparticles partial oxidation and ion irradiation with different fluences on the crystalline structure, phase composition and magnetic anisotropy is analysed by X-ray diffraction, the Mössbauer spectroscopy and vibrating sample magnetometry. The origin of the detected progressive enhancement of perpendicular magnetic anisotropy as the result of films oxidation and irradiation is discussed in the context of formation of nanoparticles oxide shells and ion tracks along the films normal.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 206-209
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of degradation of electrical properties after thermal oxidation of p-type Cz-silicon wafers
Autorzy:
Maoudj, M.
Bouhafs, D.
Bourouba, N.
Khelifati, N.
El Amrani, A.
Boufnik, R.
Hamida Ferhat, A.
Powiązania:
https://bibliotekanauki.pl/articles/1054957.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
81.16.Pr
88.40.jj
Opis:
In this study we conducted thermal oxidation of Czochralski p-type <100> silicon wafers. The oxidation was carried out at temperatures in the range of 850-1000°C, in a gas mixture of N₂:O₂, in order to deposit a thin layer (10 nm) of thermal silicon dioxide (SiO₂), generally used in the surface passivation of solar cells. The measurements of effective minority carriers lifetime τ_{eff} using the quasi-steady-state photoconductance have shown degradation of different samples after oxidation process. The calculation of surface recombination velocity after the oxidation process at different temperatures, gave the same value of 40 cm s¯¹, showing a low surface recombination velocity and, therefore, a good surface passivation. Finally, a study based on sample illumination technique, allowed us to conclude that our samples are dominated by bulk Shockley-Read-Hall recombination, caused by Fe-related centers, thereby causing the degradation of the lifetime of minority carriers.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 725-727
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Fluence Nitrogen Ion Implantation οn Pseudoelastic Behaviour of NiTi Shape Memory Alloy
Autorzy:
Levintant-Zayonts, N.
Kucharski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1503941.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
81.40.Jj
61.72.U-
61.72.-y
Opis:
An attempt to evaluate mechanical properties changes (superelastic phenomena) in the shape memory NiTi alloy (austenitic form) due to ion implantation ($N^{+}$, fluences of 1 × $10^{17}$ and 4 × $10^{18} cm^{-2}$) has been made. We applied the differential scanning calorimetry technique and spherical indentation (micro- and nanoindentation scale) test to study superelastic effect. The results of investigations of selected functional properties, i.e. characteristic temperatures, total and recovered penetration depth on the implanted and non-implanted NiTi samples are presented.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 79-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First-Principles Study of Structural, Elastic and Mechanical Properties of Zinc-Blende Boron Nitride (B3-BN)
Autorzy:
Daoud, S.
Loucif, K.
Bioud, N.
Lebgaa, N.
Powiązania:
https://bibliotekanauki.pl/articles/1419742.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
62.20.D-
61.66.-f
62.20.de
81.40.Jj
31.15.E-
Opis:
First principles study of structural, elastic properties and anisotropy effect on the mechanical parameters of the zinc-blende boron nitride has been performed using the pseudopotential plane wave method based on density functional theory with the Teter and Pade exchange-correlation functional of the local density approximation. The equilibrium lattice constant, molecular and crystal densities, bond length, the independent elastic constants, bulk modulus and its pressure derivatives, compressibility, shear modulus, internal strain parameter, isotropy factor, compliance constants, the Debye temperature, Young's modulus, Poisson's ratio, the Lamé constants and sound velocity for directions within the important crystallographic planes of this compound are obtained and analyzed in comparison with the available theoretical data reported in the literature.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 109-115
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First principles study of mechanical stability and thermodynamic properties of K₂S under pressure and temperature effect
Autorzy:
Boufadi, F.
Bidai, K.
Ameri, M.
Bentouaf, A.
Bensaid, D.
Azzaz, Y.
Ameri, I.
Powiązania:
https://bibliotekanauki.pl/articles/1070528.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
81.40.Jj
71.15.Ap
62.20.dj
Opis:
First principles calculations on structural, elastic and thermodynamic properties of K₂S have been made using the full-potential augmented plane-waves plus local orbitals within density functional theory using generalized gradient approximation for exchange correlation potentials. The ground state lattice parameter, bulk moduli have been obtained. The second-order elastic constants, Young and shear modulus, Poisson ratio, have also been calculated. Calculated structural, elastic and other parameters are in good agreement with available data. The elastic constants and thermodynamic quantities under high pressure and temperature are also calculated and discussed.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 315-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic-plastic transition in MBE-grown GaSb semiconducting crystal examined by nanoindentation
Autorzy:
Majtyka, A.
Trębala, M.
Tukiainen, A.
Chrobak, D.
Borgieł, W.
Räisänen, J.
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1075863.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Jj
62.20.F-
81.15.Hi
81.05.Ea
Opis:
The present paper concerns the elastic-plastic nanodeformation of Te-doped GaSb crystals grown by molecular beam epitaxy on the n-type of GaSb substrate. The conventional analysis of nanoindentation data obtained with sharp triangular (Berkovich) and spherical tip revealed the elastic modulus (E=83.07± 1.78 GPa), hardness (H=5.19±0.25 GPa) and "true hardness" (H_{T}=5.73±0.04 GPa). The registered pop-in event which indicates the elastic-plastic transition in GaSb crystal points towards the corresponding yield strength (σ_{Y}=3.8±0.1 GPa). The origin of incipient plasticity in GaSb crystal is discussed in terms of elastic-plastic deformation energy concept.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1131-1133
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hard Cyclic Viscoplastic Deformation on Phases Chemical Composition and Micromechanical Properties Evolution in Single Crystal Ni-Based Superalloy
Autorzy:
Kommel, L.
Powiązania:
https://bibliotekanauki.pl/articles/1402123.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.70.-q
81.40.Jj
87.15.Vv
89.90.+n
Opis:
The phases chemical composition and micromechanical properties in single crystal of Ni-based superalloy with chemical composition of 12.1 Al, 5.3 Cr, 9.4 Co, 0.8 Nb, 0.9 Ta, 0.7 Mo, 2.5 W, 0.7 Re and Ni-balance (in at.%) were changed during hard cyclic viscoplastic deformation at room temperature. The method we used based on the Bauschinger effect. The changes in the dendritic microstructure and chemical composition were characterized by scanning electron microscopy and energy dispersive spectrometry. The phases micromechanical properties evolution were characterized by nanoindentation. The results show that the cumulative strain or strain energy density increase arouse the interdiffusion of atoms between the different phases and the phases equilibrium in SC was changed. It is established that the interdiffusion rate depends on elements atoms activation energy. The new γ-γ'-eutectic pools were formed in the primary dendrites region (with fine γ/γ'-phase) and as result the length of newly formed dendrites was decreased significantly. The maximal and plastic depth of nanoindentation were measured and the corresponding micromechanical properties of phases calculated.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 681-683
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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