Hydrothermal Synthesis and Characterization of KxNa(1−x)NbO3 Powders
Hydrothermal Synthesis and Characterization of KxNa(1−x)NbO3 Powders
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DOI：
10.1111/j.1744-7402.2007.02165.x
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发表时间：
2007-12
影响因子：
2.1
通讯作者：
Junhua Lv;Mei Zhang;Min Guo;Wen-chao Li;Xidong Wang
中科院分区：
文献类型：
--
作者：
Junhua Lv;Mei Zhang;Min Guo;Wen-chao Li;Xidong Wang
采用水热法成功地制备了NaNbO 3、KNbO 3和KxNa（1-x）NbO 3粉体。X射线衍射（XRD）结果表明，产物为正交晶系，在碱性溶液中，随着K +/Na +比值的增大，KxNa（1-x）NbO 3的x值逐渐增大。采用扫描电镜、能谱仪和透射电镜对产物的形貌和微观结构进行了研究，结果表明：溶液中K +与Na +的比例对产物的形貌和尺寸有很大的影响。当溶液中K +与Na +的摩尔比为4：1 ~ 6：1时，可合成出具有准同型相界组成的Na 0.5K0.5NbO3。根据实验结果，提出了KxNa（1-x）NbO 3晶体的可能形成机理。
NaNbO 3 , KNbO 3 , and K x Na( 1-x )NbO 3 powders were successfully prepared by the hydrothermal method. The phase of the products was identified to be orthorhombic structure by X-ray diffraction (XRD) technique, and the XRD results revealed that the x value of the K x Na( 1-x )NbO 3 gradually increased with the increase in the ratio of K + to Na + in alkaline solution. The morphology and the microstructure were investigated by scanning electron microscopy, energy-dispersive spectroscopy, and transmission electron microscopy, and the results indicated that the ratio of K + to Na + in the solution had a great effect on the morphology and the size of products. Na 0.5 K 0.5 NbO 3 with morphotropic phase boundary composition could be synthesized when the molar ratio of K + to Na + was between 4:1 and 6:1 in the solution. A possible formation mechanism of the K x Na (1-x) NbO 3 crystal was also proposed based on the experimental results.