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Piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)-BaTiO_(3) composite ceramics with Mg doping

查看全文 作　　者：Chaobin [1,2,3,4]Jiang;Chao [1,2,3,4]Ma;Qian [1,2,3]Luo;Kanghui [1,2,3]Liu;Lu [1,2,3]Qin;Zhentao [1,2,3]Wu;Wanqiang [1,2,3,4,5]Cao;Yong [1,2,3,4]Chen 高影响力作者 机构地区：[1]School of Physics and Electronic Science Hubei University,Wuhan,Hubei 430062,P.R.China;[2]Hubei Key Laboratory of Ferro-&Piezoelectric Materials and Devices School of Physics and Electronic Science,Hubei University Wuhan,Hubei 430062,P.R.China;[3]Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei University,Wuhan,Hubei 430062,P.R.China;[4]MOE Key Laboratory of Green Preparation and Application for Functional Materials School of Materials Science and Engineering,Hubei University Wuhan,Hubei 430062,P.R.China;[5]School of Materials Science and Engineering,Hubei University Wuhan,Hubei 430062,P.R.China高影响力机构 出　　处：《Journal of Advanced Dielectrics》索引2019年第9卷第1期,共6页高影响力期刊 基　　金：We wish to thank China Scholarship Council(CSC).CSC supports us as academic visitors to join Derek C.Sinclair’s Research Group at the Department of Materials Science and Engineering, University of Sheffield, UK. We thank thefunding of Natural Science Foundation of Hubei Province,China (Grant No. 2017CFB574). 摘　　要：As one of the representatives of lead-free NBT ceramics,Na_(0.5)Bi_(4.5)Ti_(4)O_(15) has still attracted much attention due to its excellent dielectric properties and has become the focus of research.However,its piezoelectric properties are far from satisfactory.In order to improve the piezoelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15),Na_(0.5)Bi_(4.5)Ti_(4-x)Mg_(x)O_(y)–BaTiO_(3)(NBTM–BT)composite ceramics were synthesized by a conventional mixed oxide route and sintered at 1040℃ through two-step method.We optimized the electrical properties of NBTM–BT by changing the stoichiometric ratio of Mg content and studied its microscopic mechanism.The piezoelectric coefficient(d33)is stable at about 20 pC/N.Moreover,the maximum remanent polarization(2Pr)of the ceramic is 3.08C/cm^(2) with the coercive field of 18.01 kV/cm.The dielectric constant and dielectric loss for Na_(0.5)Bi_(4.5)Ti_(3.96)Mg_(0.04)–BT composite ceramic were found to be 486 and 0.17 at 10 kHz,respectively.The characteristic peaks of BT and Na_(0.5)Bi_(4.5)Ti_(4)O_(15) can be observed clearly from the X-ray diffraction analysis.SEM analysis showed that all samples were well crystallized.Consequently,the piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)–BT composite ceramic will be enhanced much by Mg doping,which means it has a wider range of applications in electronic devices such as piezoelectric devices. 关 键 词：Na_(0.5)Bi_(4.5)Ti_(4)O_(15) piezoelectric ceramics ferroelectric properties
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