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    Wyświetlanie 1-11 z 11
    Tytuł:
    Phonon Images of Crystals for Different Sources
    Autorzy:
    Jasiukiewicz, Cz.
    Paszkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929612.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kl
    66.70.+f
    Opis:
    The focusing patterns for energy and quasi-momentum are obtained for different types of phonon sources. We considered point and extended (Gaussian) sources and sources of monochromatic and Planckian phonons.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 459-473
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusive Propagation of Phonon Beams in Yttrium Aluminum Garnets Containing Substitutional Rare Earth Atoms
    Autorzy:
    Ivanov, S.
    Khazanov, E.
    Paszkiewicz, T.
    Taranov, A.
    Wilczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872971.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Mt
    66.70.+f
    05.60.+w
    Opis:
    The diffusive maxima of phonon signals are studied for a number of solid solutions of rare earth atoms in yttrium aluminum garnets. The used exact formula for the diffusion constants allows for qualitative discussion of the obtained results. The established energy of phonons, forming the diffusive maximum of phonon signal of the temperature T$\text{}_{H}$ arriving at the bolometer, ranges from 3.2k$\text{}_{B}$T$\text{}_{H}$ to 4.2k$\text{}_{B}$T$\text{}_{H}$, which is in reasonable agreement with the existing estimations. The qualitative analysis allows us to estimate the contribution, made by the rare earth ions occupying the octahedral positions of the sixfold oxygen coordination, to the scattering of phonons due to lattice imperfections in yttrium aluminum garnets.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 381-386
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Images of the Response Signal of a 2D Gas of Carriers to a Pulsed Beam of 3D Phonons
    Autorzy:
    Jasiukiewicz, Cz.
    Lehmann, D.
    Paszkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929698.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    66.70.+f
    73.40.Lq
    Opis:
    The patterns for the time integrated drag current induced by a pulsed beam of bulk phonons in a 2D gas of charge carriers are calculated. A beam of Planckian phonons propagates in a GaAs crystal. We considered a 2D gas of electrons lying in a {001} plane and a 2D gas of holes lying in the {311} plane. Planckian phonons are radiated by an extended (Gaussian) source.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 661-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of Superconductor Bolometer to Phonon Fluxes
    Autorzy:
    Danilchenko, B. A.
    Jasiukiewicz, Cz.
    Paszkiewicz, T.
    Wolski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035733.pdf
    Data publikacji:
    2003-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Kp
    02.30.Hq
    66.70.+f
    Opis:
    A metallic film bolometer with heat capacity C is in contact with thermal bath and with crystalline specimen and is biased by a constant current I$\text{}_{b}$. The thermal contact of the bolometer is characterized by the thermal conductance G. The bolometer operates in the linear regime of dependence of resistance on temperature characterized by a constantα. Experiments which allow one to measureα, C, and G are proposed. The characteristic timeτ=C/G and characteristic current I$\text{}_{m}=\sqrt{\text{G/α}}$ affect the effective relaxation rateΛ of the bolometer resistance R$\text{}_{b}$(t). The knowledge of the power W(t) absorbed by detector allows one to calculate R$\text{}_{b}$(t). The inverse problem of calculation of W(t) from known R$\text{}_{b}$(t) is also solved. The suitable algorithms are proposed. Deconvoluted absorbed power is obtained for experiments performed on GaAs and compared with phonoconductivity signal of two-dimensional electron gas structure as well as with results of Monte Carlo computer experiments.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 4; 325-338
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of $GdCa_4O(BO_3)_3$ Single Crystals
    Autorzy:
    Bodzenta, J.
    Kaźmierczak-Bałata, A.
    Łukasiewicz, T.
    Hofman, B.
    Kucytowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811523.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Tv
    42.70.Hj
    65.40.-b
    66.30.Xj
    66.70.-f
    Opis:
    Single crystals of $GdCa_4O(BO_3)_3$ were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-27-A-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Metal Coated Diamond Crystallites by Combined Photoacoustic Effect and Photothermal Radiometry
    Autorzy:
    Delgadillo-Holtfort, I.
    Gibkes, J.
    Chirtoc, M.
    Neubauer, E.
    Bein, B.
    Pelzl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811541.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Pm
    43.35.Ud
    78.20.Nv
    65.40.-b
    66.70.+f
    Opis:
    Photoacoustic effect and photothermal radiometry were applied to characterise the thermal properties of diamond crystallites which were coated by a Cu film, a Cr film and a Cr-Cu film. The Cu-coated diamond exhibits a considerable thermal barrier at the Cu-diamond interface which had disappeared for the crystallites with a thin bond Cr layer between diamond and Cu. The comparison of the responses of both measurement techniques reveals the non-negligible influence of the optical absorption in the visible and IR on the deduced thermal parameters.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-57-A-61
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Stabilities and Elastic Constants of EuX (X = O, S, Se, and Te) Compounds at High Pressure
    Autorzy:
    Kong, B.
    Zhou, Z.
    Sun, X.
    Zhang, L.
    Ling-Hu, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400144.pdf
    Data publikacji:
    2013-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.-f
    46.70.-p
    61.43.-j
    75.50.-y
    Opis:
    The structural stabilities, elastic properties and charge transfers of EuX (X = O, S, Se, Te) compounds as a function of pressure are investigated extensively using first-principles calculations. The ground-state parameters, such as lattice constants, bulk modulus are predicted and compared with the available data, our results are satisfactory. The calculated phase transition pressures from the NaCl-type (B1) structure to the CsCl-type (B2) structure for EuX (X = O, S, Se, Te) also accord with the experiments. Particularly, the elastic constants of EuX (X = O, S, Se, Te) under zero pressure and high pressure are simulated appropriately for the first time via density functional theory. The softening behaviors of the elastic shear modulus $C_{44}$ under pressure for the B1 phase of EuX (X = O, S, Se, Te) are captured, which should be responsible for the pressure-induced structural phase transition in the EuX system. It is also suggested that the softening behavior might be induced partly by the p → d and f → d electron transfers of Eu atom under pressure. In addition, the aggregate elastic modulus (B, G, E), Poisson's ratio (σ), Debye temperature $\Theta p_{D}$ are also successfully obtained for both B1 and B2 phases of EuX.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 4; 720-727
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Crystal Structure Behaviour of Complex Yttrium Aluminium Oxides YAlO_3 and Y_3Al_5O_{12}
    Autorzy:
    Senyshyn, A.
    Vasylechko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399474.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    61.05.F-
    65.40.De
    65.60.+a
    63.70.+h
    Opis:
    Crystal structures of two yttrium aluminium oxides, namely $YAlO_3$ and $Y_3Al_5O_{12}$, were investigated in the temperature range 3.4-300 K by high-resolution neutron powder diffraction. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Thermal expansion of yttrium aluminium oxides was evaluated in terms of 1st order Grüneisen approximation, where the Debye temperatures and the Grüneisen parameters have been estimated for both compositions. Anomalies in the thermal expansion of yttrium aluminium perovskite have been observed and modelled using the Einstein oscillator with negative Grüneisen parameter. Extended bond length analysis revealed significant thermally-driven modifications of the aluminium-oxygen framework.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 329-335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NiTi shape memory marformed alloy studied by electron beam precession TEM orientation mapping method
    Autorzy:
    Świec, P.
    Zubko, M.
    Lekston, Z.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055112.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.fg
    62.20.F-
    61.43.Dq
    61.66.Bi
    68.37.Ef
    62.25.-g
    64.70.Nd
    Opis:
    Severe plastic deformation by cold-rolling in martensitic state was applied to Ni_{50.4}Ti_{49.6} shape memory alloy. Received materials with 17, 20, 25, and 35% deformation were further annealed at 450°C for 15 min. After such treatment hardness of this alloy increased significantly reaching 365 HV0.5 for highest deformation degree. Calorimetric studies revealed two-stage and two-step character of martensitic transformation occurring in all specimens. Nanocrystalline structure with average grain size 53, 34, 28, and 24 nm was obtained. In material with 35% of deformation amorphous regions containing a nuclei of B2 parental phase with average size of 5 nm were observed. To determine the crystallographic orientation of observed nanograins and for better phase analysis, electron beam precession transmission electron microscopy orientation mapping was performed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1307-1310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Low Temperature Annealing on Microstructural and Optical Properties of $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ Thin Films
    Autorzy:
    Dughaish, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400390.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    77.55.F-
    78.20.Ci
    78.66.-w
    81.15.-z
    81.40.Ef
    81.70.Fy
    Opis:
    $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ thin films were prepared by electron beam evaporation method. X-ray diffraction and scanning electron microscopy revealed the amorphous structure for the as-prepared films. The thin films were annealed at temperatures: 200, 300, 400 and 500C for 1 h in air. Small and low intensity crystalline peaks were observed at annealing temperature of 200C for 1 h. The intensity and the number of the crystalline peaks were increased with increasing annealing temperature. Nanocrystals, of dimensions in the range 60-76 nm, were obtained when the annealing was performed at 500°C. The indexed diffraction pattern of the annealed thin film revealed a monoclinic structure. A two-layer model was used to describe the experimental ellipsometric data. The Bruggeman effective medium approximation was used to describe the surface roughness layer and the Cauchy dispersion relation was used to describe the main $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ layer. The optical constants of the thin films over 300-1100 nm spectral range were measured. The optical band gap showed gradual decrease with the annealing temperature. The accurate determination of the optical constants of the thin films is very useful and should be taken into consideration in the design of devices using optical thin films technology.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 87-91
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration and Luminescence Spectroscopic Investigations of the Alkali Rare Earth Double Phosphates M$\text{}_{3}$(RE,Eu)(PO$\text{}_{4}$)$\text{}_{2}$ (M=K, Rb; RE=La, Gd)
    Autorzy:
    Kloss, M.
    Schwarz, L.
    Hölsä, J. P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1995573.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.-f
    61.66.Fn
    63.20.-e
    71.20.Dg
    71.20.Eh
    71.70.-d
    78.30.-j
    78.55.-m
    Opis:
    The room temperature IR- and Raman spectra of the different M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ (M = K, Rb; RE = La, Eu, Gd) double phosphates were analysed and used to interpret the vibronic side band structure in the photoluminescence spectra. The intraconfigurational 4f-4f electronic transitions in the photoluminescence spectra of the Eu$\text{}^{3+}$ doped M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ were analysed in detail. The crystal field fine structure of the $\text{}^{5}$D$\text{}_{0}$ → $\text{}^{7}$F$\text{}_{J}$ (J=0-4) transitions was analysed accounting for the information on the crystal structure. The effect of the temperature as well as the alkali host cation was evaluated. Finally, a preliminary crystal field energy level scheme for the $\text{}^{7}$F$\text{}_{J}$ (J=0-4) ground term was deduced from the analysis of the photo-luminescence as well as IR- and Raman spectra.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 343-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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