Microstructure and Mechanical Properties of High-Pressure Li_xNa_1-xTa_yNb_1-yO₃ Solid Solution Perovskite Ceramics

Abstract

The effects of the temperature of synthesis and component concentration on microstructure of high-pressure Li_xNa_1-xTa_yNb_1-yO₃ solid solution perovskite ceramics (х = 0.12, 0.17; у = 0; у ≥ 0.5) were studied. Original results of elastic properties of high-pressure Li_xNa_1-xTa_yNb_1-yO₃ (х = 0.17; 0 ≤ у ≤ 0.5) solid solutions measured by contact probe techniques are reported. The observed decrease of the modulus of elasticity with increasing the sintering temperature of Li_0,17Na_0,83Ta_yNb_1-yO₃ solid solutions is assumed to be related to conditions of re-crystallisation of disordered solid solutions at synthesis under high pressure.

Keywords:

• Niobate ceramics
• solid solutions
• microstructure
• modulus of elasticity

Acknowledgments

The study has been supported by grant № 12-03-00515-a of the Russian Foundation for Fundamental Research and by Latvian Council of Science, project number 09.1548.