Relation between Elastic Modulus C₄₄ and Covalency in NaCl Type Alkali Halides

Abstract

It is shown that there exist empirical relations between the elastic modulus C₄₄ of the NaCl type alkali halides and the Szigeti charge. By reason of these empirical relations it is concluded that the elastic modulus C₄₄ relates to covalency on the hypothesis that the Szigeti charge represents substantially the static charge (J. Phys. Soc. Jpn. 49 (1980) 213, 218).