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《Chinese Journal of Inorganic Chemistry》 2017-09
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Preparation of Zirconia Nanorods by Molten Salt Method

GAO Qi-Wei;JIANG Wei-Hui;LIU Jian-Min;FENG Guo;CHEN Ting;MIAO Li-Feng;School of Material Science and Engineering, Jingdezhen Ceramic Institute;National Engineering Research Center for Domestic and Building Ceramics;  
Zirconia nanorods were prepared via molten salt route, using zirconia dry gel powder as precursor synthesized by non-hydrolytic sol-gel(NHSG) method. Differential thermal analysis and thermogravimetric analysis(DTA-TG), X-ray diffraction analysis(XRD), transmission electron microscope(TEM) and field emission scanning electron microscopy(FE-SEM) were employed to characterize the phase transformation process of zirconia, the influences of the type, amount of molten salt and the role of fluoride on the formation of zirconia nanorods. The results show that the optimized molten salt type and dosage are NaVO_3 and 1∶1(mmolten salt∶mxerogel mass ratio), respectively, and the monoclinic zirconia nanorods grow preferentially along the [010] direction in the presence of sodium fluoride. It is found that the F-in the flux plays a vital role in formation of zirconia nanorods:on one hand, the fluoride ions accelerate the mass transfer of Zr~(4+) ions and the dissolution of zirconia xerogel in molten salt system; on the other hand, fluoride ions adsorb on high-energy facets of the zirconia to block the growth along these facets. The interaction of two aspects promotes the formation of zirconia nanorods in large scale.
【Key Words】: zirconia nanorods non-hydrolytic sol-gel process molten salt fluoride
【Fund】: 国家自然科学基金(No.51662016 51362014);; 江西省优势科技创新团队建设计划项目(No.20133BCB24010)资助
【CateGory Index】: TB383.1;TQ134.12
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