Microstructure and piezoelectric properties of AC poled relaxor-PbTiO3 perovskite single crystals

• DOI: 10.20517/microstructures.2024.96
• Publication Date: 2025-05-07T09:52:24Z
• Authors: Hiroshi Maiwa; Yu Xiang; Yan Sun; Ho-Yong Lee; Yohachi (John) Ya...

High-performance perovskite relaxor-PbTiO3 (relaxor-PT) piezoelectric single crystals (SCs) fabricated by the melt-growth Bridgeman method have been widely used in medical ultrasound imaging devices as probes and high-performance underwater equipment since around 2,000. To improve properties of these SCs, use alternating-current poling (ACP) instead conventional DC has adopted 2018. Macro- microstructural observations scanning electron microscopy (SEM) are best way to easily confirm relationship between electrical macro- microstructure. After optimal ACP, fine 109° domain layers 0.5 several µm parallel electrodes obtained, contributing 10%-100% improvement dielectric constant constant. Relaxor-PT SCs solid state crystal growth with self-poring, excellent composition uniformity machinability, high performance, low acoustic impedance due inclusion spherical micropores also discussed.