Enhancement of piezoelectric properties with high Curie temperature in CaBi_(2)Nb_(2)O_(9) via MnO_(2) doping  

MnO_(2)掺杂提高CaBi_(2)Nb_(2)O_(9)压电陶瓷的压电性能和居里温度

作　　者：Meng-si WANG Yan ZHANG Xiao-gang LUO Lin TANG Shan XIANG Ru GUO Xue-fan ZHOU Ke-chao ZHOU Dou ZHANG 王梦思;张妍;罗小刚;汤林;向珊;郭茹;周学凡;周科朝;张斗(中南大学粉末冶金国家重点实验室,长沙410083;香港中文大学机械与自动化系,香港999077)

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]Department of Mechanical and Automation Engineering,The Chinese University of Hong Kong,Hong Kong 999077,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期552-562,共11页中国有色金属学报(英文版)

基　　金：National Key Research and Development Program of China (No. 2022YFB3807404);State Key Laboratory of Powder Metallurgy, the National Natural Science Foundation of China (No. 52102150, 52302158);Xiaomi Young Talents Program, China。

摘　　要：MnO_(2)-doped Ca_(0.97)Bi_(2.03)Nb_(2)O_(9) ceramics with greatly improved piezoelectric performance were prepared via conventional solid state sintering method.The effects of MnO_(2) doping on the microstructure and electrical properties of Ca_(0.97)Bi_(2.03)Nb_(2)O_(9) ceramics were studied.X-ray diffraction(XRD)analysis and Rietveld refinement revealed a reduction in orthorhombicity with MnO_(2) doping,which contributed to the enhancement of the piezoelectric properties.Furthermore,the introduction of MnO_(2) lowered the sintering temperature,thereby reducing the formation of oxygen vacancies in the ceramic.The optimal performance was achieved in the Ca_(0.97)Bi_(2.03)Nb_(2)O_(9)−0.3wt.%MnO_(2) sample,exhibiting a piezoelectric coefficient(d33)of 13.6 pC/N,a DC resistivity of 3×10^(6)Ω·cm at 500℃,and a Curie temperature of 965℃.Additionally,all doped samples demonstrated excellent thermal stability over a wide temperature range,from room temperature to 900℃.通过固相烧结法制备MnO_(2)掺杂的Ca_(0.97)Bi_(2.03)Nb_(2)O_(9)陶瓷,其压电性能得到了显著提升。研究MnO_(2)掺杂对Ca_(0.97)Bi_(2.03)Nb_(2)O_(9)陶瓷显微组织和电学性能的影响。X射线衍射(XRD)分析及Rietveld精修结果表明,MnO_(2)的掺杂降低了正交畸变程度,从而有助于提高压电性能。此外,MnO_(2)的引入降低了烧结温度,从而抑制了陶瓷中氧空位的形成。性能最优的样品为Ca_(0.97)Bi_(2.03)Nb_(2)O_(9)-0.3%MnO_(2)(质量分数),其压电系数(d_(33))达到13.6 p C/N,在500℃时的直流电阻率为3×10^(6)Ω·cm,居里温度为965℃。另外,所有掺杂样品在室温至900℃的宽温度范围内均表现出优异的热稳定性。

关 键 词：CaBi_(2)Nb_(2)O_(9)ceramics MnO_(2)doping crystal structure oxygen vacancy 

分 类 号：TQ174.1[化学工程—陶瓷工业]