|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Domain Wall Behavior and Phase Transitions of Ba(Zr0.2Ti0.8)O3-50(Ba0.7Ca0.3)TiO3 under Frequency of 0.2Hz-1.2 MHz
||Le Zhang, Michael Carpenter, Xiaobing Ren
|On-Site Speaker (Planned)
Ba(Zr0.2Ti0.8)O3-50(Ba0.7Ca0.3)TiO3 (BZT-50BCT) with ultrahigh piezoelectricity of d33= 580~620pC/N, has attracted much attention from academic institutions or industrial companies. In this work, we mainly characterize its elastic behavior, domain wall dynamics and phase transitions in wide frequency range by utilizing Resonant Ultrasound Spectroscopy (RUS, 0.1-1.2MHz), dielectric permittivity (LCR, 60Hz-100kHz) and dynamic modulus analysis (DMA, 0.2-20Hz) with varying temperature. We found there are two phase transitions existing at the MPB of BZT-50BCT no matter under higher or lower electric or elastic activated signal, confirming the existence of an independent intermediate orthorhombic phase. We also make clear the contribution of non-180° domain wall motion to the large piezoelectricity at the MPB of BZT-50BCT. Furthermore, the non-180°domain wall motion exhibits differently in DMA and RUS, higher kinetics in DMA than that in RUS. This is considered to be associated with that RUS with low activation exclude long range domain wall motion.
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