Electrical properties of 0.87Na0,5Bi0,5TiO3-0.13BaTiO3 single crystals

V. M. Sidak Oles Honchar Dnipro National University, 72 Gagarin Ave., Dnipro, 49010, Ukraine
A. Yu. Tuluk Oles Honchar Dnipro National University, 72 Gagarin Ave., Dnipro, 49010, Ukraine
M. P. Trubitsyn Oles Honchar Dnipro National University, 72 Gagarin Ave., Dnipro, 49010, Ukraine
T. V. Kruzina Oles Honchar Dnipro National University, 72 Gagarin Ave., Dnipro, 49010, Ukraine

Keywords: Na0.5Bi0.5TiO3 - BaTiO3 crystal, dielectric relaxation, conductivity, oxygen vacancy

Abstract

Electrical properties of as- grown and heat treated in air 0.87Na_0,5Bi_0,5TiO₃-0.13BaTiO₃ single crystals were studied in AC fi eld in the range 0.5–100 kHz from 300 to 800 K.

It was shown that permittivity and conductivity strongly depend on heat treatment.

Annealing at 1070 K removes slow relaxation of permittivity and decreases conductivity.

It is supposed that dielectric dispersion is determined by the dipole defects formed by oxygen vacancies.

The effect of BaTiO₃ additive on electrical properties of Na_0,5Bi_0,5TiO₃ crystal is discussed.

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