Theory of Instability Phenomena in Crystals

Abstract

The crystal instability due to anharmonic lattice vibrations is discussed by applying the self-consistent Einstein theory to three dimentional crystal systems. It is shown that there exist a mode connected with the crystal instability which depends on the crystal structure and symmetry. The Lindemann parameter is obtained on the basis of this model, and the results are compared with the experimental data for BCC and FCC metals.