2003•Journal of Functional BiomaterialsOpen access

Sduty on preparation of ultra-fine bismuth oxide powder by reversing-titration method

HE Wei-ming

Abstract

An improved precipitation method-reversing-titration method was introduced to prepare ultra-fine bismuth oxide powder with analytical pure bismuth nitrate in this paper. According to the results of TG/DSC analysis, the major component of the precipitation was BiOOH. The powder calcined at 450℃ was charactered by XRD and TEM. The results showed that the powder wasα-Bi_2O_3 and the average particle size was about 60nm. In addition, the mechanism of the formation of ultra-fine bismuth oxide was discussed with thermodynamical analysis, and the preparation condition of ultra-fine bismuth oxide by reversing-titration was determined.

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Key concepts: Bismuth, Materials science, Calcination, Reversing, Titration, Precipitation, Oxide, Particle size