Preparation of nanocrystalline Mg4Nb2O9 by citrate gel method

Bulletin of Materials Science

关键词: Ceramics;    oxides;    electron microscopy;    X-ray methods;    magnesium niobate.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A gel was formed when a aqueous solution of Mg(NO3)2, NbF5 and citric acid in stoichiometric ratio was heated on a water bath. No precipitation was observed at acidic pH and gellation was complete with evaporation of the solvent. This gel on decomposition at 750°C produced nanocrystallites of ternary oxide, Mg4Nb2O9 (M4N2). The phase contents and lattice parameters were studied by powder X-ray diffraction (XRD) at various temperatures. Particle size and morphology were studied by transmission electron spectroscopy (TEM). For comparison, M4N2 powders were also prepared by conventional ceramic route at 900°C.

【 授权许可】

CC BY