Accession Number : AD0640944

Title :   THE PSEUDOHARMONIC THEORY OF LATTICE VIBRATIONS,

Corporate Author : CHICAGO UNIV ILL INST FOR THE STUDY OF METALS

Personal Author(s) : Cohen,Morrel H. ; Martin,Richard M.

Report Date : 1965

Pagination or Media Count : 3

Abstract : A self-consistent harmonic hamiltonian is derived to describe lattice vibrations in an anharmonic crystal. The force constants are shown to be both self-consistent averages of derivatives of the instantaneous potential energy and derivatives of the free energy with respect to the mean atomic positions at all temperatures. Questions of thermodynamic stability and structural phase transitions are thus embraced by the present theory. (Author)

Descriptors :   (*CRYSTAL LATTICES, *VIBRATION), POTENTIAL THEORY, ENERGY, STATISTICAL MECHANICS, THERMODYNAMICS, PHASE STUDIES

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE