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Deciphering the leakage conduction mechanism of BiFeO_(3)–BaTiO_(3)lead-free piezoelectric ceramics

查看全文 作　　者：Mengping [1]Xue;Yucheng [1]Tang;Zhihang [1]Shan;Yijin [1]Hao;Xiaoxiao [1]Zhou;Xiaoqi [1]Gao;Hezhang [2]Li;Jun [1]Pei;Boping [1]Zhang 高影响力作者 机构地区：[1]The Beijing Municipal Key Laboratory of New Energy Materials and Technologies,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;[2]Department of Precision Instrument,Tsinghua University,Beijing 100084,China高影响力机构 出　　处：《Journal of Advanced Ceramics》索引2023年第12卷第10期,共13页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.52072028,52032007);National Key R&D Program of China(No.2022YFB3807400). 摘　　要：BiFeO_(3)–BaTiO_(3)(BF–BT)based piezoelectric ceramics are a kind of high-temperature lead-free piezoelectric ceramics with great development prospects due to their high Curie temperature(TC)and excellent electrical properties.However,large leakage current limits their performance improvement and practical applications.In this work,direct current(DC)test,alternating current(AC)impedance,and Hall tests were used to investigate conduction mechanisms of 0.75BiFeO_(3)–0.25BaTiO_(3)ceramics over a wide temperature range.In the range of room temperature(RT)−150℃,ohmic conduction plays a predominant effect,and the main carriers are p-type holes with the activation energy(Ea)of 0.51 eV.When T>200℃,the Ea value calculated from the AC impedance and Hall data is 1.03 eV with oxygen vacancies as a cause of high conductivity.The diffusion behavior of thermally activated oxygen vacancies is affected by crystal symmetry,oxygen vacancy concentration,and distribution,dominating internal conduction mechanism.Deciphering the conduction mechanisms over the three temperature ranges would pave the way for further improving the insulation and electrical properties of BiFeO_(3)–BaTiO_(3)ceramics. 关 键 词：BiFeO_(3)-BaTiO_(3)(BF-BT) leakage behavior conduction mechanism oxygen vacancies Hall test
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