Large electrostrain in Bi_(1/2)Na_(1/2)TiO_(3)-based relaxor ferroelectrics:A case study of Bi_(1/2)Na_(1/2)TiO3-Bi_(1/2)K_(1/2)TiO_(3)-Bi(Ni_(2/3)Nb_(1/3))O_(3) ceramics  

作　　者：Guangzhi Dong Huiqing Fan Laijun Liu Pengrong Ren Zhenxiang Cheng Shujun Zhang 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an,710072,China [2]Institute for Superconducting and Electronic Materials,Australia Institute of Innovative Materials,University of Wollongong,Wollongong,2522,Australia [3]College of Materials Science and Engineering,Guilin University of Technology,Guilin,541004,China [4]Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,School of Materials Science and Engineering,Xi’an University of Technology,Xi’an,710048,China

出　　处：《Journal of Materiomics》2021年第3期593-602,共10页无机材料学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(51672220,51902258,51972265);Fundamental Research Funds for the Central Universities(3102019GHXM002);State Key Laboratory of Solidification Processing Project(2019-TZ-04)of China,China Postdoctoral Science Foundation(2019M653729);Natural Science Foundation of Shaanxi Province(2019JQ-621);the Shaanxi Province Postdoctoral Science Foundation(2017BSHEDZZ07).

摘　　要：(1-x)(0.8Bi_(1/2)Na_(1/2)TiO3-0.2Bi_(1/2)K_(1/2)TiO3)-xBi(Ni_(2/3)Nb_(1/3))O3(BNKT-xBNN)solid solution ceramics were fabricated by high temperature solid-state reaction method.All the compositions possess relaxor ferroelectric features,among which the ergodic BNKT-0.02BNN exhibits large repeatable electrostrain value Suni¼0.51%at electric field of 65 kV/cm,with high piezoelectric stain coefficient d33*of 890 pm/V at 45 kV/cm,while the non-ergodic compositions present unrepeatable large strain response.Based on the electric field-composition phase diagram,the repeatability of strain response in ergodic compositions can be attributed to the reversible electric-field-induced phase transition.In addition,the effects of BNN contents on the macroscopic strain properties are explored by analyzing the existing states of the polar regions with corresponding thermal evolutions and electric-field-induced phase transitions.This research is expected to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties.

关 键 词：BNT Electrostrain Mechanism Lead free Relaxor ferroelectric Phase diagrams 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ174.75[化学工程—陶瓷工业]