CHARGE REDISTRIBUTION AND PIEZOELECTRIC CONSTANTS

The contributions of internal strain and charge redistribution to the piezoelectric constants of tetrahedrally coordinated ANB8-N crystals are discussed. It is shown that the reversal of sign of the piezoelectric constant on going from N=1 and 2 to N=3 can be explained quantitatively in terms of the dependence of charge redistribution on bond ionicity. © 1969 The American Physical Society.