Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics
Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics
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DOI：
10.1007/s10854-009-9971-7
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
Dunmin Lin;Qiaoji Zheng;Kin-wing Kwok;Chenggang Xu;Chun Yang
中科院分区：
文献类型：
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作者：
Dunmin Lin;Qiaoji Zheng;Kin-wing Kwok;Chenggang Xu;Chun Yang
采用传统陶瓷工艺制备了无铅MnO 2掺杂的K0.5Na0.5Nb0.92Sb0.08O3陶瓷，并对其介电和压电性能进行了研究。结果表明，少量的MnO_2（0.5- 1.0mol%）就能提高陶瓷的致密化程度，降低陶瓷的烧结温度。MnO 2掺杂和Sb替代的共同作用导致铁电和压电性能的显著改善。当MnO 2掺杂量为0.5mol%时，K0.5Na0.5Nb0.92Sb0.08O3陶瓷的最佳性能为：d33= 187 pC/N，kP= 47.2%，εr= 980，tanδ= 2.71%，Tc = 287 °C。由于K0.5Na0.5Nb0.92Sb0.08O3具有较高的四方-正交相转变温度（TO-T~ 150 °C），掺杂0.5mol%MnO2的K0.5Na0.5Nb0.92Sb0.08O3陶瓷具有良好的热稳定性。
Lead-free MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3ceramics have been fabricated by a conventional ceramic technique and their dielectric and piezoelectric properties have been studied. Our results show that a small amount of MnO2(0.5–1.0 mol%) is enough to improve the densification of the ceramics and decrease the sintering temperature of the ceramics. The co-effects of MnO2doping and Sb-substitution lead to significant improvements in the ferroelectric and piezoelectric properties. The K0.5Na0.5Nb0.92Sb0.08O3ceramic with 0.5 mol%MnO2doping possesses optimum propeties:d33= 187 pC/N,kP= 47.2%,εr= 980, tanδ= 2.71% andTc= 287 °C. Due to high tetragonal-orthorhombic phase transition temperature (TO-T~ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3ceramic with 0.5 mol%MnO2doping exhibits a good thermal stability of piezoelectric properties.