Different effect of Li^(+),Na^(+),K^(+)-doping on crystal structure and electrical property of Sr_(0.6)Ba_(0.4)Nb_(2)O_(6)  

作　　者：Jian Guo Xinrui Yang Yulong Yang Shuting Pang Shan-Tao Zhang Bin Yang 

机构地区：[1]National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences&Jiangsu Key Laboratory of Artificial Functional Materials&Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210023,China [2]Nanjing University(Suzhou)High-tech Institute,Suzhou Industrial Park,215123,China [3]School of Physics,Nanjing University,Nanjing,210093,China [4]Functional Materials and Acousto-Optic Instruments Institute,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin,150080,China

出　　处：《Journal of Materiomics》2024年第5期1071-1079,共9页无机材料学学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.12174179);the Natural Science Foundation of Jiangsu Province(No.BK20221251);the Dengfeng B project of Nanjing University and the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX23_0149).

摘　　要：Ferroelectric Sr_(0.6)Ba_(0.4)Nb_(2)O_(6)(SBN)shows typical unfilled tetragonal tungsten bronze structure where 1/6 A sites and all C sites are unoccupied.The presence of such structural vacancy provides the possibility to further modulate the crystal structure and electrical properties.In this work,alkali ions(Li^(+),Na^(+),K^(+))doped SBN ceramics have been fabricated via solid-solution reaction method.In general,each doping promotes the crystal structure evolves from unfilled toward filled tungsten bronze.However,the different doping ion radius causes the differences in occupying initial structural vacancies,resulting in significantly different electrical properties,Li^(+)doping enhances relaxor characteristic whereas Na+and K^(+)doping lead to normal ferroelectric behavior,accompanying an increase in Curie temperature(TC)from 36℃ of SBN to 40,212,148℃ of Li^(+),Na^(+)and K^(+)doping,respectively.Benefiting from improved relaxor degree and high density,the Li^(+)doped SBN displays a good energy storage performance.Since the ratio of Sr/Ba and(Sr+Ba)/Nb has not been changed,this work presents direct evidence for the effect of structural vacancy on crystal structure and properties,as well as inspiration for further work on unfilled tungsten bronze.

关 键 词：Sr_(0.6)Ba_(0.4)Nb_(2)O_(6) oxides Structural vacant ALKALI ions DOPING 

分 类 号：TB33[一般工业技术—材料科学与工程]