High Dielectric Permittivity in AFe$_{1 / 2}$B$_{1 / 2}$O$_{3}$ Nonferroelectric Perovskite Ceramics (A - Ba, Sr, Ca; B - Nb, Ta, Sb)

TL;DR

This study synthesizes AFe$_{1/2}$B$_{1/2}$O$_{3}$ ceramics and finds they exhibit very high dielectric permittivity over a wide temperature range, primarily due to Maxwell-Wagner polarization effects.

Contribution

It demonstrates high dielectric permittivity in nonferroelectric perovskite ceramics and identifies the Maxwell-Wagner mechanism as the key cause.

Findings

High dielectric permittivity observed across wide temperature range

Maxwell-Wagner mechanism identified as main source

Ceramics synthesized with various A and B site elements

Abstract

AFe$_{1 / 2}$B$_{1 / 2}$O$_{3}$(A- Ba, Sr, Ca; B-Nb, Ta, Sb) ceramics were synthesized and temperature dependencies of the dielectric permittivity were measured at different frequencies. The experimental data obtained show very high values of the dielectric permittivity in a wide temperature interval that is inherent to so-called high-k materials. The analyses of these data establish a Maxwell-Wagner mechanism as a main source for the phenomenon observed.