|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XVII
||The Role of Retained Structures in Phase Transition and Piezoelectric Properties of PMN-PT Single Crystals
||Hooman Sabarou, Vadym Drozd, Dehua Huang, Yu Zhong
|On-Site Speaker (Planned)
A series of thermodynamic investigations has been conducted on Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystals to study the effect of phase transitions on piezoelectric properties of the system. The research discusses the transition between two piezoelectric rhombohedral and paraelectric cubic phases during heating and cooling with variation in oxygen partial pressure (P(O2)). Crystal structure changes have been investigated by thermal analyses, in-situ XRD at high temperatures, Raman spectroscopy at high temperatures under high and low P(O2). Piezoelectric properties of the single crystals have been analyzed by impedance measurement techniques. Based on the results, a new mechanism has been suggested to explain the leading role of metastable phases and retained structures in piezoelectric properties. The thermodynamic approach discusses how defect chemistry controls the phase transition in PMN-PT system and consequently leaves an impact on piezoelectric properties. The findings in the current research address the electrical fatigue phenomenon in PMN-PT system.
||Planned: Supplemental Proceedings volume