Preparation of nanocrystalline Mg4Nb2O9 by citrate gel method

Bulletin of materials science

A Vadivel Murugan³  A B Gaikwad²  V Ravi¹ 

[1] Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, IndiaPhysical and Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$;Centre for Materials Characterization, National Chemical Laboratory, Pune 411 008, India$$Centre for Materials Characterization, National Chemical Laboratory, Pune 411 008, IndiaCentre for Materials Characterization, National Chemical Laboratory, Pune 411 008, India$$;Centre for Materials for Electronics Technology (C-MET), Department of Information Technology, Pune 411 008, India$$Centre for Materials for Electronics Technology (C-MET), Department of Information Technology, Pune 411 008, IndiaCentre for Materials for Electronics Technology (C-MET), Department of Information Technology, Pune 411 008, India$$

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

DOI  :  

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】

Unknown