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The displacements of Fe 3+  (at the Ta 5+  site) along the [001] direction in KTaO 3  crystal, caused by the electric field, have been studied by calculating the electric-field-induced zero-field splittings from the microscopic mechanisms and the empirical superposition model. It is found that the Fe 3+  displacements obtained by the two methods at the same electric-field strength and temperature are close to each other. These displacements are also close to that estimated from the force-balance equation. It is suggested that the electric-field-induced zero-field splitting can be attributed primarily to the above displacement and the temperature dependence of the electric-field-induced zero-field splitting is mainly due to the change in the dielectric constant of KTaO 3  with temperature.

Investigation of the Electric-field Effect in EPR Spectra of Fe 3+ in KTaO 3