Modified phase transition and electrical properties of [Li0.05(Na0.535K0.48)0.95]- (Nb0.94Sb0.06)O3 lead-free piezoelectric ceramic by sintering temperature
来源期刊：Rare Metals2012年第6期
论文作者：ZHAO Xiaokuna, ZHANG Bopinga, ZHAO Leia, ZHU Lifenga, LI Yana, and CHENG Liqianb a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing , China b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing , China
文章页码：590 - 594
摘 要：Li/Sb-doped （Na,K）NbO3 with a nominal composition of [Li0.05（Na0.535K0.48）0.95]（Nb0.94Sb0.06）O3 ceramic was synthesized by normal sintering. The phase structure, microstructure, and electrical properties were investigated with a special emphasis on the influence of the sintering temperature. A polymorphic phase transition （PPT） from orthorhombic to tetragonal symmetry was observed when the sintering temperature was raised from 1040 to 1050 ℃, whereby the piezoelectric coefficient d33 and the electromechanical coupling coefficient kp reached the peak values of 245 pC·N-1 and 41.2%, respectively. The PPT induced by varying the sintering temperature is due to the different volatilization extents of alkali metals and appears to a lower sintering temperature with increasing Li content. The trace modifying of alkali metal content is more effective than doping B site element to enhance the d33 value.
ZHAO Xiaokuna, ZHANG Bopinga, ZHAO Leia, ZHU Lifenga, LI Yana, and CHENG Liqianb a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
摘 要：Li/Sb-doped （Na,K）NbO3 with a nominal composition of [Li0.05（Na0.535K0.48）0.95]（Nb0.94Sb0.06）O3 ceramic was synthesized by normal sintering. The phase structure, microstructure, and electrical properties were investigated with a special emphasis on the influence of the sintering temperature. A polymorphic phase transition （PPT） from orthorhombic to tetragonal symmetry was observed when the sintering temperature was raised from 1040 to 1050 ℃, whereby the piezoelectric coefficient d33 and the electromechanical coupling coefficient kp reached the peak values of 245 pC·N-1 and 41.2%, respectively. The PPT induced by varying the sintering temperature is due to the different volatilization extents of alkali metals and appears to a lower sintering temperature with increasing Li content. The trace modifying of alkali metal content is more effective than doping B site element to enhance the d33 value.
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