四方相KTN纳米粉体的水热合成及机理  

Synthesis and Mechanism of Ferroelectric Potassium Tantalate Niobate Nanoparticles by the Solvothermal and Hydrothermal Processes

作　　者：颜莉[1] 金祥瑞[2] 刘艳军[2] 

机构地区：[1]广东工业大学实验教学部,广东广州510006 [2]武汉科技学院理学院,湖北武汉430073

出　　处：《武汉大学学报（理学版）》2008年第2期167-170,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(10572052)

摘　　要：采用传统的水热法和混合溶剂热法制备了高纯的四方相KTN纳米粉体KTa0.3Nb0.7O3.研究表明,水热法中影响粉体结构的关键因素是KOH的浓度,而混合溶剂热法中影响粉体结构的关键因素则为溶剂组分.随着晶粒尺寸增大,钽铌酸钾发生三方-四方相变.该结果显示,由于异丙醇处于超临界状态,混合溶剂热法在更温和的条件下有效合成铁电钽铌酸钾材料.High-purity KTa0.3 Nb0. 7O3 nanoparticles have been successfully synthesized by hydrotherreal and solvothermal methods, and the synthesis mechanism was discussed. The KOH concentration and the solvent composition have important effects on the final products synthesized by hydrothermal and mixed solvothermal method, respectively. The results show the pseudo-cubic to tetragonal transition with increasing crystallite size. It is believed that supercritical isopropanol plays an important role in synthesi- zing KTa0.3Nb0. 7O3 nanoparticles under milder conditions than hydrothermal route. The present solvothermal method provides a new potential route for synthesizing ferroelectric potassium tantalate niobate material.

关 键 词：水热法 溶剂热法 KTN(钽铌酸钾) 

分 类 号：TB383[一般工业技术—材料科学与工程]