Hydrothermal synthesis and characterization of KNbO3
Potassium nibotates (KNbO3) with different morphologies were successfully prepared via a hydrothermal method using KOH and Nb2O5 as starting materials. X-ray diffraction (XRD), fourier-transform infrared (FTIR) spectra and scanning electron microscopy (SEM) were used to characterize the as-prepared samples. The synthesis conditions such as crystallization temperature and time as well as KOH concentration were investigated. The results demonstrated that the crystallization and morphology of the as-prepared samples strongly depended on the reactive temperature and the starting composition. When the KOH concentration is 10 M, the molar ratio of K:Nb is 200:1, the reactive temperature is 150 ℃, rod KNbO3 crystals were obtained. Decreasing molar ratio of K:Nb to 36:1 under otherwise identical reactive conditions leads to the formation of rod and some sheet crystals. When the molar ratio of K: Nb was 100:1, increased the reactive temperature to 180 ℃, rod-like KNbO3 crystals disappeared and the sheet KNbO3 crystal was presented. When decreasing the reactive temperature to 120 ℃, taper crystals appeared and the fiber KNbO3 crystals could be seen when the molar ratio of K:Nb is 54:1.
CAO Huiqun WEI Bo YU Bin ZHU Meifang LI Yaogang
College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen, 518060, P.R.China College of optical and elcetric Engineering, Shenzhen University, Shenzhen, 518060, P.R.China College of Material Science and Engineering, State Key Laboratory for Modification of Chemical Fi
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
1302-1304
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）