Abstract
The electric-displacement-related electrostrictive coefficient Q h of a rocksalt-type oxide, MgO, has been determined as 0.16 m 4 C -2 by measuring the hydrostatic pressure dependence of the reciprocal permittivity ( Q h =(1/2)[∂(1/ e 0 e )/∂ p ]). Comparing the Q h values of several rocksalt- and perovskite-type fluorides and oxides, a general empirical rule is proposed that the electrostrictive coefficient of fluorides is larger than that of oxides with the same crystal structure and the Q h of the rocksalt is larger than that of the perovskite. A simple shell model can describe this general tendency in conjunction with the Born-Mayer potential, where the electrostrictive coefficient is represented in proportion to a 5 / Z 2 ( a : cation-anion distance; Z : ionic valence).
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