Ferroelectric phase transition in relaxor ferroelectric single crystals 0.76PMN-0.24PT

作     者：XU Guisheng LUO Haosu WANG Pingchu Ql Zhenyi YIN Zhiwen 

作者机构：Laboratory of Functional Inorganic MaterialsShanghai Institue of CeramicsChinese Academy of SciencesShanghai 201800China Xiangtan Polytechnic UniversityXiangtan 411201China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2000年第45卷第15期

页      面：1380-1385页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China  NSFC  (59995520) 

主　　题：relaxor ferroelectrics single crystals ferroelectric phase transition domain structure PMNT. 

摘      要：The features of the single crystals 0.76PMN-0.24PT in dielectric, ferroelectric, pyroelectric properties and domain structures indicate that they are located between typical ferroelectrics and normal ones. The unpoled crystals present a transitional domain configuration between microdomains and typical macrodomains while the crystals on (001) cuts undergo field-induced phase transition under poling, showing two special temperature points Td and Tm during the succedent heating procedure. The dielectric constant starts to decrease drastically at Td during cooling, or the transformation from induced macrodomain to transitional domain takes place at Td during heating. Ferroelectric-paraelectric phase transition or depolarization continues within the whole temperature range of Td-Tm, where ferroelectric phase in the form of transitional macrodomains coexists with paraelectric phase. Then the crystals macroscopically transoform into paraelectric phase containing ferroelectric microdomains at a temperature