Addition of small amounts of BiFeO3 to (Li,K,Na)(Nb,Ta)O3 lead-free ceramics: Influence on phase structure,microstructure and piezoelectric properties |
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| Authors: | Jia-Jun Zhou Jing-Feng Li Li-Qian Cheng Ke Wang Xiao-Wen Zhang Qing-Ming Wang |
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| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, United States;1. Teaching and Research Section of Physics, Chengdu Medical College, Chengdu 610083, PR China;2. Teaching and Research Section of Chemistry, Chengdu Medical College, Chengdu 610083, PR China;1. Faculty of Engineering, Shahrekord University, Shahrekord, Iran;2. Department of Materials Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran;3. Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer, Iran;1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University, Xi?an, 710062 Shaanxi, China;2. School of Materials Science and Engineering, Xi?an University of Technology, Xi?an, 710048 Shaanxi, China;1. Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology, Chengdu 610225, PR China;2. Physics Department, Southwest University for Nationalities, Chengdu 610041, PR China |
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| Abstract: | A small amount of BiFeO3 (BF) was incorporated into lead-free Li0.03(Na0.53K0.48)0.97Nb0.8Ta0.2O3 (LKNNT) piezoceramics for the purpose of property improvement via phase structure control. It was found that the addition of BF not only induced a series of phase transformations from orthorhombic to tetragonal and further to pseudocubic in LKNNT ceramics, but also enhanced its sintering densification behavior. Even tiny amount of BF addition down to 0.5 mol% could change the room-temperature phase structure from a dominant orthorhombic state to the coexistence of orthorhombic and tetragonal phases, resulting in peak piezoelectric properties of , kp ～ 47.0%. When the amount of BF was increased to 0.75 mol%, the tetragonal phase became dominant in the modified LKNNT ceramics, which exhibited excellent temperature stability, despite its slightly lowered piezoelectric coefficients. |
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