Further Enhancing Piezoelectric Properties by Adding MnO2 in AgSbO3‐Modified (Li,K,Na)(Nb,Ta)O3 Lead‐Free Piezoceramics |
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| Authors: | Qing Liu Fang‐Yuan Zhu Lei Zhao Ke Wang Jing‐Feng Li |
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| Affiliation: | 1. Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, China;3. Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, ChinaMember, The American Ceramic Society. |
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| Abstract: | This work investigated the effect of MnO2 addition on the phase structure, microstructure, and electrical properties of AgSbO3‐modified (Li,K,Na)(Nb,Ta)O3 (abbreviated as LKNNT‐AS) lead‐free piezoelectric ceramics with an optimized composition endowed with a state of two‐phase coexistence. A small amount (0.1 wt%) of MnO2 can significantly further enhance the piezoelectric property of LKNNT‐AS ceramics, whose piezoelectric constant d33 and converse piezoelectric coefficient d33* as well as planar electromechanical coupling factor kp reach 363 pC/N, 543 pm/V, and 0.49, respectively. The temperature stability of piezoelectricity in MnO2‐modified LKNNT‐AS samples also improved, which is associated with the more uniform and better thermally stable ferroelectric domains that were revealed by piezoresponse force microscopy. |
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| Keywords: | piezoelectric materials/properties lead‐free ceramics niobium/niobium compounds ferroelectricity/ferroelectric materials manganese/manganese compounds |
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