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中文摘要：
利用水热法在碱性溶液中合成了具有钙钛矿结构的（K,Na）NbO_3无铅压电陶瓷粉体,研究了初始溶液中K＋的含量对产物晶相、形貌以及化学组成的影响。采用X射线衍射仪以及扫描电镜对产物的结构和形貌进行了表征,利用X荧光分析仪对粉体的化学组成进行了精确分析。实验结果表明：随着初始溶液中K~＋含量的变化,有两相钙钛矿（K,Na）NbO_3粉体生成,在溶液中K~＋的反应活性低于Na~＋。然后,将水热合成的K_（0.58）Na_（0.42）NbO_3粉体采用传统固相烧结制备陶瓷材料,其结构较致密,压电常数d_（33）达到94 pC/N。
英文摘要：
（K,Na）NbO_3 powers with perovskite structure were successfully prepared by hydrothermal method in alkaine solution.The influence of the molar ratio of K~＋on the structure,morphology and chemical composition of the products were investigated.The phase of the powers was investigated by X-ray diffraction （XRD）,the microstructure and morphology were investigated by SEM,the chemical composition of the products was investigated by XRF.The results show that with the change of the K~＋in the starting solutio,two-phase perovskite（K,Na）NbO_ appeared,the reactivity of K~＋was less than that of Na~＋in the solution.Then,the obtained K_（0.58）Na_（0.42）NbO_3 powders were used to fabricate lead-free piezoelectric ceramics using the traditional sintering process,and its piezoelectric constant up to d_（33）=94pC/N
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