通过添加异丙醇利用水热溶剂热法合成(K,Na)NbO3无铅压电陶瓷粉体.研究了矿化剂浓度、反应物浓度对产物晶相、粒径大小、形貌以及化学组成等的影响.利用X射线衍射仪、傅立叶变换红外吸收光谱以及扫描电子显微镜对所得粉体进行了表征.随后,利用合成的(K,Na)NbO3无铅压电陶瓷粉体,按照传统固相烧结工艺烧制压电陶瓷,并研究了其压电性能.实验结果表明:通过添加异内醇有机溶剂,可以在矿化剂浓度为2mol/L的条件下合成出纯钙钛矿结构的(K,Na)NbO3粉体.随着反应溶液中K离子含量的增加,产物中离子K的含量也在增加.组成为K0.22Na0.78NbO3样品的压电常数d33高达120 pC/N,与传统固相合成法获得的(K0.5,Na0.5)NbO3常压烧结得到的陶瓷性能相当.由此可预见利用水热溶剂热法合成的(K0.5,Na0.5)NbO3粉体烧结的陶瓷可获得更高的电学性能.
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