Microstructure, phase states, dielectric and elastic properties of ceramic solid solutions Li0,17Na0,83NbyTa1-yO3 obtained at high pressure

Abstract

Microstructure and elastic properties of ferroelectric ceramic solid solutions Li0,17Na0,83NbyTa1-yO3 with a perovskite structure were investigated, obtained by thermobaric synthesis at high pressures and temperatures. The electrical characteristics and phase states of a series of ferroelectric high-pressure solid solutions Li0,17Na0,83NbyTa1-yO3 ( y = 0,1 — 0,5 ) were investigated by the impedance spectroscopy method. Some anomalies are revealed in ε'(T) and σsv(T) dependencies associated with phase transitions in the studied ceramic samples. The values were established of the static conductivity as a function of the temperature and enthalpy of activation of charge carriers. It was found that Li0,17Na0,83NbyTa1-yO3 is a high-temperature superionic.

Keywords

• solid ferroelectric high-pressure solutions
• microstructure
• Young’s modulus
• impedance spectroscopy
• dielectric permittivity
• electrical conductivity