Crystallization of NaNbO3 microcubes by a solution-phase ion exchange route
Crystallization of NaNbO3 microcubes by a solution-phase ion exchange route
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DOI：
10.1039/c1ce05042g
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发表时间：
2011-05
期刊：
影响因子：
3.1
通讯作者：
Junshu Wu;D. Xue
中科院分区：
文献类型：
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作者：
Junshu Wu;D. Xue
采用技术上灵活的离子交换法在溶液相中结晶出铌酸钠（NaNbO 3）微晶。首先通过水热法生长了一种KNHS前驱体，这种亚稳态化合物在NaOH溶液中具有化学活性，通过自发离子交换和重结晶过程结晶出NaNbO 3微晶。离子交换时间，NaOH浓度，表面活性剂，和反应介质（水，乙二醇/水，乙二胺/水）的形态和晶相的NaNbO 3微晶的关键影响也已建立。目前的化学路线提供了一种非常简单，温和和有效的配方来结晶NaNbO 3，这可能会扩展到具有良好控制的化学成分，结构和颗粒形态的更多结晶晶体。
Sodium niobate (NaNbO3) microcrystals were crystallized by a technically flexible ion exchange method in solution phase. A potassium niobate hollow sphere (KNHS) precursor was first grown via a hydrothermal route, the metastable compound is chemically active in NaOH solution, leading to the crystallization of NaNbO3 microcrystals by a spontaneous ion exchange and recrystallization process. The crucial influences of ion exchange duration, NaOH concentration, surfactant, and reaction medium (water, ethylene glycol/water, ethylenediamine/water) on both the morphology and crystal phase of the NaNbO3 microcrystals have also been established. This current chemical route provides an extremely simple, mild, and effective recipe to crystallize NaNbO3, which could possibly be expanded to more niobate crystals with well controlled chemical compositions, structures, and particle morphologies.