The electric-displacement-related electrostrictive coefficient Qh of a rocksalt-type oxide, MgO, has been determined as 0.16 m4C-2 by measuring the hydrostatic pressure dependence of the reciprocal permittivity(Qh=(l/2)[∂(l/∊0∊)/∂p].Comparing the Qh 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 Qh of the rocksalt is larger than that of the perovskite. A simple shell model can describe this general tendency in conjunction with the Bom-Mayer potential,where the electrostrictive coefficient is represented in proportion to a5/Z2(a: cation-anion distance;Z:ionic valence).
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the Physical Society of Japan|
|State||Published - Jan 1 1984|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)