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水热合成KNbO_3粉体的理论设计与实验研究 被引量:1

Theoretical Design and Expeerimental Study of Hydrothermal Synthesis on KNbO_3 Powders
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摘要 以K-Nb-H2O三元体系为研究系统,在Lencka-Riman热力学模型的框架内,对水热法合成KNbO3粉体进行了理论设计,得到了体系稳定产出相图和优化的合成条件包括反应温度、反应物浓度和溶液的pH控制等重要信息.研究结果表明,前驱物浓度和pH调节(矿化剂KOH浓度)是形成纯相KNbO3必需的条件.在此基础上,利用简单的五氧化二铌和KOH做前驱物,在523K反应温度,高强碱性溶液条件下,常规水热法成功合成了纯相的KNbO3粉体.实验研究和理论设计十分吻合. In the framework of Lencka–Riman thermodynamic model,we studied on the theoretical design for synthesis of KNbO3 powder by hydrothermal processing in the K-Nb-O system.As the result of the calculations,stability and yield diagrams of the investigated system were obtained.Thus,the optimum conditions(i.e.,temperature,synthesis precursor concentrations,solution pH) for the hydrothermal synthesis of phase-pure KNbO3 were presented.The calculated results suggested that the concentrations of precursors and pH-adj...
出处 《襄樊学院学报》 2008年第2期18-22,51,共6页 Journal of Xiangfan University
关键词 水热合成 KNBO3 热力学模型 稳定产出相图 Hydrothermal synthesis KNbO3 Thermodynamic model Stability and yield diagrams
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