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    Wyświetlanie 1-11 z 11
    Tytuł:
    Pressure Dependence of the Raman Frequencies of Ammonia Solid I near the Melting Point
    Autorzy:
    Yurtseven, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025788.pdf
    Data publikacji:
    2001-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.70.+h
    Opis:
    We calculated in this study the Raman frequencies of some lattice modes in the melting region of ammonia solid I. The Raman frequencies of those phonon modes were obtained through the Grüneisen relation using the volume data for the ammonia solid I from the literature. Our calculated Raman frequencies require for comparison the experimental Raman frequencies measured as a function of pressure for some fixed temperatures in the ammonia solid I.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 5; 557-564
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Displacive Phase Transformations and Generalized Stacking Faults
    Autorzy:
    Paidar, V.
    Ostapovets, A.
    Hardouin Duparc, O.
    Khalfallah, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418492.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.70.+h
    Opis:
    The displacive phase transformations can be considered as composed of two processes, namely, pure displacements, shuffling or shearing of atomic planes, and supplementary homogeneous lattice deformation changing also the dimensions of the moving planes. Such deformation causes shape memory effect when the structural transformation is reversed. General displacements of atomic planes will be examined, i.e. γ-surface type calculations will be reported for single plane shuffling, alternate shuffling of every other bcc atomic plane and successive displacements of parallel atomic planes producing in combination with homogeneous deformation the close packed structures. The results of calculations using the many-body potentials of the Finnis-Sinclair type will be compared with ab initio calculations that indicate in which way the phase transformation can be initiated.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 490-492
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topological Model of Austenite-Martensite Interfaces in Cu-Al-Ni Alloy
    Autorzy:
    Ostapovets, A.
    Zarubova, N.
    Paidar, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418493.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.70.+h
    Opis:
    Discussion of the austenite-single-variant martensite interfaces in Cu-Al-Ni alloy is performed in the frame of a topological model of martensite interfaces. This model takes into account admissible defects lying in the interface. The results are compared with the experimental data obtained on the foils of Cu-Al-Ni alloys deformed in situ in a transmission electron microscope.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 493-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane
    Autorzy:
    Yurtseven, H.
    Cebeci, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398881.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.70.+h
    64.70.Dv
    Opis:
    The pressure dependence of the Raman frequencies for the $ν_{21}$ mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter $γ_{T}$ in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 744-747
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometry of the $\text{}^4T_{2g}$ Excited State in $Cs_2SiF_6:Mn^{4+}$
    Autorzy:
    Reisz, A.
    Avram, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815472.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ej
    63.20.Kr
    63.70.+h
    Opis:
    The aim of this paper is to calculate the equilibrium displacements of the $\text{}^4T_{2g}$ potential surface minimum from the ground state along the $a_{1g}$ and $e_g$ Jahn-Teller active modes for the octahedral $[MnF_6]^{2-}$ cluster obtained by doping $Mn^{4+}$ ions in $Cs_2SiF_6$ host crystal. The equilibrium displacements in normal and Cartesian coordinates were estimated from force constants of $[MnF_6]^{2-}$ cluster and Huang-Rhys factors associated with the Jahn-Teller stabilization energy. A net equatorial expansion and an axial stretching of the geometry of the $[MnF_6]_{2-}$ cluster in first $\text{}^4T_{2g}$ excited state, as combined effect of the $a_{1g}$ and $e_g$ displacements, were demonstrated.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 829-833
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry Driven Phase Transformations
    Autorzy:
    Damczyk, J.
    Ostasiewicz, K.
    Radosiński, Ł.
    Radosz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535592.pdf
    Data publikacji:
    2010-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.-a
    64.60.-i
    63.70.+h
    Opis:
    Motivated by the properties of one-dimensional lattice systems with asymmetric on-site potential, one can formulate a hypothesis of an asymmetry driven phase transformation. Characteristic feature of one-dimensional systems exhibiting asymmetry driven phase transformation is a sequence of the two phase conversions. In particular class of such systems with a triple-well potential, phase conversions of one-dimensional systems would evolve into a sequence of two phase transitions in three-dimensional models. We propose here a model of three-dimensional system exhibiting a sequence of two first order asymmetry driven phase transitions.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 4; 527-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Debye-Waller Factor in an Isotopically Disordered Semiconductor Crystal
    Autorzy:
    Gairola, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398919.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.70.+h
    87.64.Bx
    63.20.-e
    63.20.Pw
    64.70.kg
    Opis:
    The diagonal and non-diagonal parts for the Debye-Waller factor have been established using equation of motion technique of quantum dynamics and the Dyson equation approach. The double time temperature dependent phonon Green function has been taken to find the phonon linewidth and phonon shift. Renormalized mode frequency has been investigated in terms of electron-phonon coupling constant and temperature. The effect of electron-phonon interaction on the Debye-Waller factor has been studied in low temperature limit in low impurity concentration in semiconductor crystals.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1141-1146
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure and X-Ray Photoelectron Spectra of YNi$\text{}_{4}$B Compound
    Autorzy:
    Pugaczowa-Michalska, M.
    Chełkowska, G.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036993.pdf
    Data publikacji:
    2003-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    82.80.Pv
    71.20.-b
    63.70.+h
    Opis:
    The electronic structure of the ternary YNi$\text{}_{4}$B compound, crystallizing in the hexagonal CeCo$\text{}_{4}$B structure (P6/ mmm space group), was studied by X-ray photoelectron spectroscopy and ab initio calculations. Core levels and the valence band were investigated. The X-ray photoelectron spectroscopy valence band is compared with that obtained from ab initio calculations. The valence band spectrum at the Fermi level exhibits the domination of the Ni(3d) states, which are hybridized with 4d states of Y and 2p states of B. The theoretical electronic specific heat coefficientγ derived from N(E$\text{}_{F}$) is about 11.33 mJ/(mol K$\text{}^{2}$) for experimental lattice parameters. The calculated bulk modulus is B$\text{}_{0}$=1.61632 Mbar.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 5; 487-494
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lattice Dynamical Investigation of the Raman and the Infrared Wave Numbers of $MnWO_4$
    Autorzy:
    Gupta, H.
    Ruby, -
    Sinha, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419784.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Ah
    63.22.Dc
    63.70.+h
    75.10.Pq
    78.30.-j
    Opis:
    A short-range force constant model has been applied using normal coordinate analysis to investigate the Raman and the infrared modes in multiferroic $MnWO_4$ having space group P2/c. The calculation of zone centre phonons has been made with eight stretching and seven bending force constants. The calculated Raman and infrared wave numbers are in good agreement with the observed ones. The potential energy distribution has also been investigated for determining the significance of contribution from each force constant toward the Raman and the infrared wave numbers.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 142-145
    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:
    Magnetite Fe$\text{}_{3}$O$\text{}_{4}$: the Correlated Electron-Phonon System
    Autorzy:
    Kozłowski, A.
    Kąkol, Z.
    Tarnawski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047312.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    75.40.-s
    63.20.Kr
    71.30.+h
    75.30.Cr
    Opis:
    In the paper the influence of magnetic as well as electron-lattice interactions on the Verwey transition in magnetite related compounds is discussed based on the authors' experimental activity and available literature. While magnetism was proved to only reflect the transition, the results of nuclear inelastic scattering show that lattice dynamics actively participates in it. The studies of diffuse neutron scattering and heat capacity suggest also that the low temperature lattice properties of slightly doped magnetite are distinct from those with higher dopant concentration. Finally, recent theoretical results strongly suggest that the Verwey transition in magnetite cannot be understood and described without strong involvement of electron-lattice interactions.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 537-547
    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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