文献类型：期刊文献

中文题名：CaZrO_(3)改性(Na,K)NbO_(3)基无铅陶瓷电学性能的温度稳定性

英文题名：Temperature-stable electrical properties of CaZrO_(3)-modified(Na,K)NbO_(3)-based lead-free piezoceramics

作者：陈小明 王明焱 唐木智明 李国荣

第一作者：陈小明

通信作者：Chen, XM[1];Chen, XM[2];Chen, XM[3]

机构：[1]贵州理工学院,贵州省轻金属材料制备技术重点实验室,贵阳550003;[2]贵州理工学院材料与能源工程学院,贵阳550003;[3]中国科学院上海硅酸盐研究所,上海200050;[4]成都市消防救援支队,成都610000;[5]日本富山县立大学工学部,富山9390398

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;corresponding author), Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China.|贵州理工学院;

年份：2021

卷号：70

期号：19

起止页码：190-198

中文期刊名：物理学报

外文期刊名：Acta Physica Sinica

收录：CSTPCD;;EI(收录号：20214211041909);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：Project supported by the National Natural Science Foundation of China (Grant No. 52162015), the Science and Technology Fund of Education Bureau of Guizhou Province, China (Grant No. [2020]1Y204), the Natural Science Foundation of Department of Education of Guizhou Province, China (Grant No. KY [2018]253), and the Doctor Starting Foundation of Guizhou Institute of Technology, China (Grant No. XJGC20190920).

语种：中文

中文关键词：无铅压电陶瓷;(K;Na)NbO_(3);三方-四方相界;温度稳定性

外文关键词：lead-free piezoceramics;(K,Na)NbO3;R-T phase boundary;temperature stability

摘要：压电陶瓷广泛用于驱动器、传感器等电子领域,但是目前主要使用的压电陶瓷是铅基陶瓷.基于保护环境和社会可持续发展的需要,无铅压电陶瓷的研发变得迫切.无铅压电陶瓷(K,Na)NbO_(3)(KNN)因具有较高压电常数和居里温度,而受到广泛关注.然而较差的温度稳定性限制了其应用.本文通过二步合成法制备了电学性能温度稳定的(1-x)(Na_(0.52)K_(0.48))_(0.95)Li_(0.05)NbO_(3)-xCaZrO_(3)(NKLN-xCZ)陶瓷,研究了CaZrO_(3)对KNN基陶瓷微结构及电学性能的作用.研究结果表明:适量CaZrO_(3)改善了样品烧结性能,得到了致密陶瓷.随CaZr O_(3)增加,NKLN-CZ陶瓷的三方相(R)-四方相(T)共存出现在组分为0.05 ≤x ≤0.06.x=0.05时,陶瓷样品不但具有高居里温度(T_(c)=373 ℃),而且表现出良好电学性能(d_(33)=198 pC/N,k_(p)=39%,ε_r=1140,tanδ=0.034,P_(r)=21μC/cm^(2),E_(c)=18.2 kV/cm).此外,该陶瓷由于存在弥散R-T相变,导致其相变温度区间拓宽,因此,该陶瓷具有较好的电学性能温度稳定:在温度范围为-50—150 ℃,NKLN-0.05CZ陶瓷的k_(p)保持在34%—39% (k_(p)变化量≤13%).
Piezoelectric ceramics are mainly used in the electronic fields such as actuators,sensors,etc.However,at present the piezoelectric ceramics widely used are lead-based ceramics,which are detrimental to the environment.Based on the needs of environmental protection and social sustainable development,the research of lead-free piezoelectric ceramics becomes urgent.(K,Na)NbO_(3)(KNN)lead-free piezoelectric ceramics have attracted much attention due to their high piezoelectric coefficient and Curie temperature.However,temperature stability of ceramics is poor,which limits their applications.In this work,(1-x)(Na_(0.52)K0.48)_(0.95)Li_(0.05)NbO_(3)-xCaZrO_(3)(NKLN-xCZ)ceramics with temperature stability are prepared by two-step synthesis.The effects of CaZrO_(3) on the phase structure,microstructure and electrical properties of KNN-based ceramics are studied.The results show that the appropriate introduction of CaZrO_(3) can improve the sintering properties of the samples and obtain dense ceramics.All the samples have typical perovskite structure without impurity.With the increase of CaZrO_(3),the temperature of orthorhombic(O)-Tetragonal(T)phase transition(TO-T)and Curie temperature(TC)move from high temperature to low temperature,while the transition temperature(TO-R)moves from low temperature to room temperature,and then,tetragonal(T)phase and rhombohedral(R)phase coexist in NKLN-xCZ ceramics as 0.05≤x≤0.06.When x=0.05,the ceramics have high Curie temperature(T_(c)=373℃),and show good piezoelectric and ferroelectric properties(piezoelectric constant d33=198 pC/N,planar electromechanical coupling coefficient kp=39%,εr=1140,tanδ=0.034,P_(r)=21μC/cm^(2),E_(c)=18.2 kV/cm)because of the density of ceramics and existence of R-T phase boundary around room temperature.In addition,the relative permittivity of ceramics changes with the increase of frequency,which shows a certain relaxation behavior.The relaxation characteristics can be expressed by the modified Curie-Weiss law(1/εr-1/εr,m)=C(T-Tm)α.With the increase of CZ content,the dispersion coefficientαof ceramics increases(x=0.07,α=1.96),which can be ascribed to A-site cation disorder induced by the addition of CZ.The temperature range of phase transition is widened because of the diffused R-T phase transition.Therefore,the ceramics have temperature-stable electrical properties:the kp of NKLN-_(0.05) CZ ceramics is kept at 34%-39%(variation of kp≤13%)in a temperature range of-50-150℃.It provides methods and ideas for further exploring the temperature stability of KNN-based ceramics.