Fundamental Understanding of Ferroelectric Properties in Piezoelectric Ceramics from Viewpoints of Domain Alignment

Abstract

Research and development of controlling and evaluation on ferroelectric domain structures are described in piezoelectric ceramics composed of lead zirconate titanate, lead titanate, barium titanate, alkali bismuth niobate and alkali bismuth titanate. Ferroelectric domain switching and domain rotation could be explained by DC poling field dependence of dielectric and piezoelectric properties. In addition, Young's modulus and Poisson ratio toward poling field in piezoelectric ceramics were investigated by measuring longitudinal and transverse acoustic wave velocities to clarify the relationships between high piezoelectricity and the values. Increasing domain alignment by applying poling field, basically, the Young's modulus decreased and Poisson ratio increased.

Keywords:

• Piezoelectric ceramics
• DC poling field dependence
• ferroelectric domain
• domain clamping
• acoustic wave velocity
• elastic constant