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BiFeO_3-K_(0.5)Na_(0.5)NbO_3无铅压电陶瓷的烧结工艺

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Abstract:

采用传统固相烧结法制备性能良好的铁酸铋(BiFeO3,BF)掺杂的铌酸钾钠(K0.5Na0.5NbO3,KNN)压电陶瓷(BF-KNN),着重研究BF摩尔(下同)掺量对KNN结构与压电性能的影响规律以及BF-KNN陶瓷的烧结工艺。结果表明适量BF有利于提高BF-KNN的压电性能,当BF掺量≥1%后,压电性能急剧降低。与仅烧结一次的样品相比,二次烧结BF-KNN陶瓷形成更加稳定的正交晶系钙钛矿结构,陶瓷组织致密,压电性能大幅度提高,压电常数(d33)、平面机电耦合系数(kp)与机械品质因数(Qm)分别达134pC/N、46%和364,但介电性能明显降低,相对介电常数(εr)从退火前的554降至388。一次、二次烧结样品的体积密度分别为4.12g/cm3和4.36g/cm3,相对密度分别为91.35%和96.67%。在温度低于490℃、频率为100kHz时,二次烧结样品的介电损耗tanδ<5%,其Curie温度高达420℃。

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