Abstract
The transverse effective charge Z T of A N B 8- N compounds is expressed as a function of the Phillips ionicity. The chemical trend of Z T for zincblende A ∣ N B ∣8- N compounds is calculated on the basis of a lattice-distortion model where atoms are assumed to be slightly displaced. 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 compounds.
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