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IJPAP Vol.43(09) [September 2005] >


Title: Temperature dependence of lattice energy of fluorite type AB2 crystals, alkaline earth oxides and heavy metal halides – Evaluation from sound velocity data
Authors: Subrahmanyam, M
Rajagopal, E
Murthy, N Manohara
Keywords: Lattice energy
Kudriavtsev's theory
Elastic constants
Ultrasonic velocity
Issue Date: Sep-2005
Publisher: CSIR
IPC CodeC08F2/56
Abstract: Lattice energies of CaF2, SrF2, BaF2, CdF2, EuF2, MgO, SrCl, AgCl and TlBr at different temperatures have been evaluated making use of single crystal elastic constant data and employing Kudriavtsev’s theory which relates the lattice energy of the crystal, U, with mean sound velocity, um, in the crystal. The lattice energies of both MgO and SrO decrease with increase in temperature and the variations are parabolic and similar. The lattice energies of AgCl and TlBr vary with temperature parabolically up to 80 K and thereafter linearly up to 300 K. The results are explained in terms of the structure of the crystals, mutual interaction of the ions and anharmonic effects associated with as a function of temperature.
Page(s): 660-663
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(09) [September 2005]

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