自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 12    No. 3    June 2005

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Preparation and structure characteristics of nano-Bi2O3powders
with mixed crystal structure
LI Wei(李 卫)

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:The nano- Bi2Opowders were prepared by a chemical precipitation method with Bi(NO3) 3, HNO3 and NaOH as reactants. The structural characteristics and morphology of nano- Bi2O3powders were investigated by X-ray diffraction and transmission electron microscopy, respectively. The results show that under the optimum condition that 300 g/L Bi(NO3) 3reacts at 90℃for 2 h, the Bi2O3 powders with 60 nm on the average and 99.5% in purity are obtained. The prepared nano- Bi2O3powders contain a mixed crystal structure of monoclinic and triclinic instead of traditional structure of monoclinicα- Bi2O3. And the mixed crystal structure is stable in air. The reason for the appearance of the mixed crystal structure may be that the ionic radius ratio of Bi3+to O2- changes easily during the formation of nano- Bi2O3 particles by a chemical precipitation method.

 

Key words: nano- Bi2O3 powders; chemical precipitation method; mixed crystal structure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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