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Sintering temperature effect on microstructure, electrical properties and temperature stability of MnO-modified KNN-based ceramics
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2018-03-20 , DOI: 10.1016/j.jeurceramsoc.2018.03.033
Zhenyong Cen , Yichao Zhen , Wei Feng , Peiyao Zhao , Lingling Chen , Xiaohui Wang , Longtu Li

Lead-free 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3 + 0.6%MnO (KNN-0.045BNZ + Mn0.6) ceramics have been prepared by a conventional solid-state sintering method in air. All the samples sintered at different temperatures possess a coexisting phase boundary (CPB) between rhombohedral (R) phase and tetragonal (T) phase. The increase of sintering temperature (Ts) increases the phase fraction of T phase in CPB region. Mn2+, Mn3+ and Mn4+ ions coexist in all the KNN-0.045BNZ + Mn0.6 ceramics sintered at 1110 °C to 1190 °C. High sintering temperature can induce a transformation from MnNb'' defects to MnNb' defects. The samples with fine grain show stable octahedral structure. The KNN-0.045BNZ + Mn0.6 ceramics with fine grain possess excellent temperature stability of d33* due to the wide phase transition region. The increase of sintering temperature induces the (R-T) phase transition temperature to move to room temperature.



中文翻译:

烧结温度对MnO改性KNN基陶瓷显微组织,电性能和温度稳定性的影响

无铅0.955K 0.5 Na 0.5 NbO 3 -0.045Bi 0.5 Na 0.5 ZrO 3  + 0.6%MnO(KNN-0.045BNZ + Mn0.6)陶瓷已通过常规的固态烧结方法在空气中制备。在不同温度下烧结的所有样品在菱形(R)相和四方(T)相之间都存在共存的相界(CPB)。烧结温度(T s)的增加增加了CPB区域中T相的相分数。Mn 2 +,Mn 3+和Mn 4+离子共存于1110°C至1190°C烧结的所有KNN-0.045BNZ + Mn0.6陶瓷中。较高的烧结温度会引起中号ññb'' 缺陷 中号ññb'缺陷。具有细晶粒的样品显示出稳定的八面体结构。具有细晶粒的KNN-0.045BNZ + Mn0.6陶瓷具有出色的温度稳定性d33*由于相变区域较宽。烧结温度的升高引起(RT)相变温度移至室温。

更新日期:2018-03-20
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