Polarization reversal via a transient relaxor state in nonergodic relaxors near freezing temperature

作     者：Chang-Hyo Hong Hanzheng Guo Xiaoli Tan John E.Daniels Wook Jo 

作者机构：School of Materials Science and EngineeringUlsan National Institute of Science and TechnologyUlsan44919Republic of Korea Department of Materials Science and EngineeringIowa State UniversityAmesIA50011USA School of Materials Science and EngineeringUniversity of New South WalesNew South Wales2052Australia 

出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)

年 卷 期：2019年第5卷第4期

页      面：634-640页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0701[理学-数学] 0702[理学-物理学] 070101[理学-基础数学] 

基　　金：the financial support by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(NRF-2018R1D1A1B07051176) the financial support by the National Science Foundation(NSF)through Grant DMR-1700014 the financial support from the ARC Discovery Project Scheme 

主　　题：Relaxor Nanodomains In situ Neutron diffraction Transmission electron microscopy 

摘      要：Among the unresolved issues in the study of relaxor ferroelectrics is the role of freezing temperature,across which the dynamics of polarization reversal in relaxor ferroelectrics *** presence of this freezing temperature is best manifested by the appearance of a double polarization hysteresis loop just above the freezing *** that the polarization pinching evolving into a double hysteresis starts well below the freezing temperature,there exists a transient temperature regime between the nonergodic and the ergodic relaxor *** clarify the role of the freezing temperature on the pinching,the polarization reversal near the freezing temperature of relaxor(Pb_(1-x)La_(x))(Zr_(1-y)T_(y))_(1-x/4)O_(3)(PLZT)was monitored using three in situ electric field methods:electrocaloric effect,neutron diffraction,and transmission electron *** demonstrate that the pinching results from a two-step process,1)domain detexturization in the ferroelectric state and 2)miniaturization of *** observation explains the recently reported gap between the depolarization temperature T_(d) and the ferroelectric-torelaxor transition temperature T_(F-R) in lead-free *** further show that T_(d) and T_(F-R),which have long been considered identical in lead-based relaxors,are not the *** current study suggests that the mismatch between T_(d) and TF-R is an inherent feature in both lead-based and lead-free relaxor ferroelectrics.