Links between non-180° domain and heterophase structures in ferroelectric solid solutions: from stress relief to phase contents

Abstract

A model of a heterophase sample with interlayers is applied to describe some two-phase states in ferroelectric 0.69BiFe_1-xGa_xO₃–0.31BaTiO₃ solid solutions with x = 0 − 0.06. Features of a coexistence of the rhombohedral and pseudocubic phases are first analysed at variations of a unit-cell parameter of the pseudocubic phase a_PC in heterophases with x = const. Conditions for the complete stress relief at planar interfaces hold in the presence of non-180° domains in the rhombohedral phase and at the aforementioned variations of a_PC. Agreement between the calculated and experimental results on contents in 0.69BiFe_1-xGa_xO₃–0.31BaTiO₃ at room temperature is achieved.

Keywords:

• Domain
• heterophase
• stress relief
• interlayer
• volume fraction

Acknowledgments

The author would like to thank Prof. Dr. A. E. Panich and Prof. Dr. I. A. Parinov (Southern Federal University, Russia), and Prof. Dr. L. N. Korotkov (Voronezh State Technical University, Russia) for their interest in the research problem. The research was supported by the Southern Federal University (research topic ‘Development and Materials-science Substantiation of the Creation of Materials and Products Based on Piezoelectric Ceramics Using Additive Technologies’, stage 2022, contract No. 176/22-D, July 11th, 2022).