Wire Structure and Morphology Transformation of Niobium Oxide and Niobates by Molten Salt Synthesis
Wire Structure and Morphology Transformation of Niobium Oxide and Niobates by Molten Salt Synthesis
复制标题
熔盐合成铌氧化物和铌酸盐的线结构和形貌转变
DOI：
10.1021/cm802776g
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发表时间：
2009-04-14
影响因子：
8.6
通讯作者：
Xing, Xianran
中科院分区：
文献类型：
--
作者：
Li, Lihong;Deng, Jinxia;Xing, Xianran
过氧化氢碱性硅酸盐，特别是一维形貌的过氧化氢碱性硅酸盐，具有许多重要的工业应用。采用基于熔盐合成的局部化学方法制备了Nb2O5和ANbO3（A = K，Na，（Na，K））纳米线。首先，在800 °C熔盐KCl环境下反应3 h制备出具有线结构的前驱体KNb3O8。然后，由线状KNb3O8前驱体得到棒状H3ONb3O8和Nb2O5。最后以Nb_2O_5为中间体合成了棒状的ANbO_3（A = K，Na，（Na，K））。当仅使用线状Nb2O5前驱体时，可以实现最终产物的线状结构。研究了质子铌酸盐、铌氧化物和铌酸盐之间的结构演化。从结构重组和原子扩散的角度阐明了这些形状转变的机理。在空气中无压烧结得到的棒状（Na，K）NbO3陶瓷具有很高的压电性能（d33 = 140 ...
Perovskite alkaline niobates, especially of one-dimensional morphology, have many important industrial applications. Wirelike Nb2O5 and ANbO3 (A = K, Na, (Na,K)) were fabricated by a topochemical method based on the molten salt synthesis. First, the precursor KNb3O8 with wire structure was prepared under the condition of molten salt KCl environment at 800 °C for 3 h. Then, rodlike H3ONb3O8 and Nb2O5 were obtained from the wirelike KNb3O8 precursor. Finally, the rodlike ANbO3 (A = K, Na, (Na,K)) were achieved with the intermediate oxide Nb2O5. The wirelike structure of the final product can be achieved when using wirelike Nb2O5 precursor only. The structural evolution was investigated among protonic niobate, niobium oxide, and niobates. The mechanism of these shape transitions was elucidated in the view of structure recombining and atomic diffusing. The (Na,K)NbO3 ceramic sintered from the as-prepared rodlike particles under pressureless condition in the air performed with high piezoelectricity (d33 = 140 ...