The Debye temperature and Grüneisen parameter of the CaLa2S4-La2S3 system

2002 ◽  
Vol 44 (6) ◽  
pp. 1067-1070 ◽  
Author(s):  
S. M. Luguev ◽  
N. V. Lugueva ◽  
Sh. M. Ismailov
Keyword(s):  
Debye Temperature ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter

Elastic and Thermal Properties of SrCo1-xScxO3-δ

2014 ◽  
Vol 975 ◽  
pp. 283-287
Author(s):  
Rasna Thakur ◽  
Rajesh K. Thakur ◽  
N.K. Gaur
Keyword(s):  
Thermal Properties ◽  
Specific Heat ◽  
Debye Temperature ◽  
Elastic Constants ◽  
Cohesive Energy ◽  
Second Order ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Rigid Ion Model

We have investigated the elastic and thermal properties for perovskite SrCo1-xScxO3-d, by means of Modified Rigid Ion Model (MRIM). We have also computed the second order Elastic constants (SOECs) and their combinations. Besides we have reported the cohesive energy (f), Debye temperature (θD) and Gruneisen parameter (γ). The variation of specific heat (C) at temperature 15 K≤x≤1000 K is computed for SrCo1-xScxO3-d. The computed properties reproduce well with the available data in literature.

ENTROPY FOR PERICLASE AT HIGH COMPRESSIONS AND AT HIGH TEMPERATURES

2011 ◽  
Vol 25 (28) ◽  
pp. 2183-2191 ◽  
Author(s):  
S. K. SHARMA ◽  
B. K. SHARMA ◽  
R. KUMAR ◽  
B. S. SHARMA
Keyword(s):  
Debye Temperature ◽  
High Temperatures ◽  
Volume Ratio ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Volume Dependence

We derive a relation for computing volume dependence of entropy at selected isotherms. This formula is based on the Al'tshuler et al. model (J. Appl. Mech. Tech. Phys.28 (1987) 129) for volume dependence of Grüneisen parameter. The formula for entropy obtained in the present study has been used to determine the results for MgO down to a volume ratio 0.50 at selected isotherms. The obtained results for entropy present a general agreement with those calculated by Cynn et al. (J. Phys. Chem.99(9) (1995) 7813). We also formulate a relationship between Debye temperature and entropy. And it is found that Debye temperature increases exponentially as entropy decreases.

On the pressure dependence of the Grüneisen parameter and debye temperature for CsI crystals

1996 ◽  
Vol 193 (2) ◽  
pp. 335-339 ◽  
Author(s):  
R. G. Kulkarni ◽  
M. Abd-Elmeguid ◽  
S. Bukshpan ◽  
K. Milants ◽  
J. Verheyden ◽  
...  
Keyword(s):  
Debye Temperature ◽  
Pressure Dependence ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter

TEMPERATURE EFFECT ON VIBRATIONAL PROPERTIES OF La0.7Sr0.3MnO3

2009 ◽  
Vol 23 (23) ◽  
pp. 4767-4777
Author(s):  
MINA TALATI ◽  
PRAFULLA K. JHA
Keyword(s):  
Debye Temperature ◽  
Phonon Dispersion ◽  
Effect Of Temperature ◽  
Grüneisen Parameter ◽  
Phonon Modes ◽  
Gruneisen Parameter ◽  
Anharmonic Lattice ◽  
Different Temperatures ◽  
Dynamical Method ◽  
Distinct Features

Temperature dependence of phonons spectra and allied properties of rhombohedral La 0.7 Sr 0.3 MnO 3 are investigated by using the lattice dynamical method. A tendency of phonon mode to instability causing JT lattice distortion is reflected in a softening of the stretching mode in the phonon dispersion curve of La 0.7 Sr 0.3 MnO 3 at both 1.6 and 300 K. While the A1g mode softens because of gradual decrease in MnO 6 rotations, the stretching mode hardens upon reduction in temperature. The distinct features of phonon modes at different temperatures are also reflected in the calculated phonon density of states. Other thermal properties such as specific heat, the Debye temperature, and Grüneisen parameter are also presented. The decrease in the Debye temperature at 300 K indicates the effect of temperature in lattice softening. Anomalously high value of the Grüneisen parameter points out the presence of anharmonic lattice modes.

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