Hydrothermal synthesis of ultrafine A5Nb4O15 (A=Ba, Sr) powders

A5Nb4O15 (A = Ba, Sr) powders with hexagonal perovskite structures have been firstly synthesized by a two-step hydrothermal process. These oxides were crystallized directly from niobium oxide in the presence of potassium basic solutions at 240 deg C for 48 h. The products were characterized by powde...

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Bibliographic Details
Published in:Materials letters 2009-05, Vol.63 (12), p.1004-1006
Main Authors: Zhou, Chao, Chen, Gang, Zhang, Hongjie, Li, Yingxuan, Pei, Jian
Format: Article
Language:English
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Summary:A5Nb4O15 (A = Ba, Sr) powders with hexagonal perovskite structures have been firstly synthesized by a two-step hydrothermal process. These oxides were crystallized directly from niobium oxide in the presence of potassium basic solutions at 240 deg C for 48 h. The products were characterized by powder X-ray diffraction and scanning electron microscopy. It was found that the pretreatment of the niobium oxide through the hydrothermal technique firstly was the critical factor to prepare these niobates. Moreover, the alkaline concentration also played an important role in the formation of these niobates. On basis of the experimental data, a possible reaction process for the formation of A5Nb4O15 (A = Ba, Sr) was proposed.
ISSN:0167-577X
DOI:10.1016/j.matlet.2009.01.068