A new sol-gel process for preparing Ba(Mg_1/3Nb_2/3)O₃ nanopowders

Fang Lian, Lihua Xu, Fushen Li, and Hailei ZhaoDepartment of Inorganic Materials, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正> Commercially available niobium （V） oxide [Nb2O5], with barium acetate [Ba（CH3COO）2] and magnesium acetate [Mg（CH3COO）2·4H2O] was used as the starting material in the sol-gel process for preparing Ba（Mg1/3Nb2/3）O3 （BMN） nanopowders. At first, Nb2O5 reacted with melting sodium hydroxide and transformed into dispersible oxide. The resulting glassy substance after cooling was dispersed and washed several times in distilled water to remove the Na+ ions. The as-prepared colloidal Nb2O5·nH2O was subsequently mixed with acetic solution of barium acetate and magnesium acetate according to the required molar proportions and followed by gelation. The ultrafine BMN powders were finally obtained after heat-treating the gel at 820℃ for 1 h, and the as-sintered nanoceramics revealed a high relative density of 98.2%, and a high microwave Q-factor, of 10397 at 1.45GHz.

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