TRANSVERSE EFFECTIVE CHARGES OF A(N)B(8-N) COMPOUNDS WITH ZINCBLENDE STRUCTURE

The transverse effective charge Z(T) of A(N)B(8-N) compounds is expres sed as a function of the Phillips ionicity. The chemical trend of Z(T) for zincblende A(N)B(3-N) compounds is calculated on the basis of a l attice-distortion model where atoms are assumed to be slightly displac ed. The calculated Z(T) is compared with the experimental Z(T) for III -V, II-VI, and I-VII compounds. It is found that the theoretical Z(T) well reproduces the observed chemical trend of Z(T) for these compound s.