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Material Sciences 材料科学, 2012, 2, 96-99 doi:10.4236/ms.2012.22017 Published Online April 2012 (/journal/ms) Synthesis of KNb O Powders with Layered Structure by a 3 8 Gel-Combustion Method Xiaoman Yuan, Junji Zhang, Bin Wu, Qiong Zhang, Shuang Tao School of Materials Science and Engineering, Dalian Jiaotong University, Dalian Email: zhangjj@ Received: Dec. 25th, 2011; revised: Jan. 6th, 2012; accepted: Jan. 14th, 2012 Abstract: The niobate (KNb O ) powders with layered structure were successfully synthesized via the citric acid 3 8 gel-combustion process using KNO and Nb O ·H O as the raw materials. Thermal behavior of the precursor was 3 2 5 2 determined by TG-DSC techniques. The phase composition and morphology of the synthesized samples were characterized by using the X-ray diffraction and scanning transmission electron microscope. It was found that KNb3O8 phase was crystallized directly from the amorphous precursor at about 600˚C. The SEM images of the samples showed that the particles were bar-like under calcination temperature of 600˚C. However, the morphology of the particles transformed into flakes gradually as the calcination temperature increasing. Keywords: Layered Niobate; KNb O ; Gel-Combustion 3 8 层状晶体结构铌酸盐KNb O 粉体的凝胶–燃烧法合成与表征 3 8 袁晓曼,张俊计,武 斌,张 琼,陶 霜 大连交通大学材料科学与工程学院,大连 Email: zhangjj@ 收稿日期:2011 年 12 月 25 日;修回日期:2012 年
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