ELECTRIC CONDUCTIVITY AT ROOM TEMPERATURE IN Li0,12Na0,88Ta0,25Nb0,75O3 SYNTHESIZED AT A HIGH PRESSURE

Abstract

A ferroelectric solid solution Li0,12Na0,88Ta0,25Nb0,75O3 with a perovskite structure, synthesized under the high pressure and temperature conditions, has been studied by impedance spectroscopy in the temperature range 290-460 K. The values of static conductivity, the most probable relaxation times as functions of temperature, the activation enthalpy of charge carriers, and the real part of the dielectric constant have been determined. It was found that at room temperature Li0,12Na0,88Ta0,25Nb0,75O3 has a high electrical conductivity, close to the superionic one. Possible mechanisms of the discovered phenomenon are discussed.

Keywords

• solid solutions
• thermobaric synthesis
• impedance spectroscopy
• electric conductivity
• charge carriers activation enthalpy