Phonon dispersion curves, frequency spectrum and specific heat of potassium

1974 ◽  
Vol 21 (1) ◽  
pp. 109-116 ◽  
Author(s):  
Satya Pal ◽  
V. P. Seth
Keyword(s):  
Specific Heat ◽  
Frequency Spectrum ◽  
Phonon Dispersion ◽  
Dispersion Curves ◽  
Phonon Dispersion Curves

THEORETICAL STUDY OF LATTICE DYNAMICAL PROPERTIES IN FERROELECTRIC LiTaO3

1992 ◽  
Vol 06 (20) ◽  
pp. 3279-3293 ◽  
Author(s):  
YIMIN JIANG ◽  
CHENG GOU
Keyword(s):  
Specific Heat ◽  
Theoretical Study ◽  
Phonon Dispersion ◽  
Dispersion Curves ◽  
Optical Data ◽  
General Function ◽  
Zero Temperature ◽  
Phonon Dispersion Curves ◽  
Maximum Value ◽  
The One

We present the phonon-dispersion curves, the one-phonon density of states, the lattice specific heat cv(T) and the Debye temperature Θ(T) of the ferroelectric LiTaO 3, based on full lattice dynamical model whose parametèrs are fitted to the optical data and neutron measured dispersion curves. A model theory is developed to describe the transition from Debye to non-Debye behaviors observed in the low temperature part of the cv/T3 curve. The cv/T3 function, when is properly scaled, can be fitted by a general function derived from the model. It can be characterized by the temperature T max at which it has maximum, its maximum value (cv/T3)T=T max and its value at zero temperature (cv/T3)T=0. These results are considered useful in searching possibly anomalous phonon behavior from the specific heat cv(T).

scholarly journals LATTICE DYNAMICAL STUDY OF TITANIUM (TI) BY USING CGW-VTBFS MODEL

2021 ◽  
Vol 9 (07) ◽  
pp. 124-129
Author(s):  
U.C Srivastava ◽  
◽  
Shyamendra Pratap Singh ◽  
Keyword(s):  
Experimental Data ◽  
Specific Heat ◽  
Shell Model ◽  
Body Force ◽  
Phonon Dispersion ◽  
Dispersion Curves ◽  
Dynamical Study ◽  
Phonon Dispersion Curves ◽  
Phonon Dynamics ◽  
Experimental Values

In measurements of the phonon dynamics of bcc Titanium (Ti), In the present paper we have reported the lattice dynamical calculations which are performed by using the Clark-Gazis-Wallis (CGW) and Van der Waalsthree body force shell model (VTBFS).The theory is used to compute the phonon dispersion curves(PDC), the Specific heat variation &frequency distribution with the used temperature. The frequencies along the symmetry directions have plotted against the wavevector to obtain the phonon dispersion curves(PDC)from the present models, with the help of available experimental values. The obtained results are agreed well with experimental data.

Phonon Dispersion Curves of aBC3Honeycomb Epitaxial Sheet

2004 ◽  
Vol 93 (17) ◽  
Author(s):  
H. Yanagisawa ◽  
T. Tanaka ◽  
Y. Ishida ◽  
M. Matsue ◽  
E. Rokuta ◽  
...  
Keyword(s):  
Phonon Dispersion ◽  
Dispersion Curves ◽  
Phonon Dispersion Curves

SiC up to 35 GPa: Eos, phonon dispersion curves and sum rule. polytypes 6H and 15R

1992 ◽  
Vol 8 (1-3) ◽  
pp. 433-435 ◽  
Author(s):  
E. V. Jakovenko ◽  
A. F. Goncharov ◽  
S. M. Stishov
Keyword(s):  
Phonon Dispersion ◽  
Dispersion Curves ◽  
Sum Rule ◽  
Phonon Dispersion Curves
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