Phase evolution of(K,Na)NbO_3 powder prepared by high temperature mixing under hydrothermal conditions

查看全文 作　　者：Lin Bai Kongjun Zhu Jinhao Qiu Hongli Ji Likui [1]Su

机构地区：[1]The Aeronautical Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

出　　处：《Particuology》索引2010年第8卷第5期,共5页

基　　金：supported by the National Natural Science Foundation of China(Nos.50872053,50830201);Program for New Century Excellent Talents in University(NCET-10-0070);Jiangsu Province Natural Science Foundation(No.BK2008399) 摘　　要：(Na,K)NbO3(KNN)powders were successfully prepared by high temperature mixing method(HTMM) under hydrothermal conditions to study the effect of reaction time on the formation of KNN for three K+/(K++Na+)ratios of 0.6,0.7 and 0.8.The products were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscopy(TEM)and selected area electron diffraction(SAED),to show the change of phase and morphology of the as-prepared particles with the K+/(K++Na+)molar ratio in the solution.Pure Na-rich KNN monoclinic phase and pure K-rich KNN orthorhombic phase could be obtained quickly after mixing the solutions at high temperature when the K+/(K++Na+)molar ratio was either 0.6 or 0.8.When the K+/(K++Na+)molar ratio was 0.7,however,the K-rich KNN orthorhombic phase grain formed first,followed by the Na-rich KNN monoclinic phase grain,with the two phases coexisting in the final product. 关键词：混合方法水热条件富钾高温制备 KNN算法钠扫描电子显微镜

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Phase evolution of(K,Na)NbO_3 powder prepared by high temperature mixing under hydrothermal conditions

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