Effect of convection gas on the synthesis of nanophase tin oxides during a gas condensation method

被引：8

作者：

Ahn, JP ^{[1
]}

Park, JK

Kim, BK

Huh, HY

机构：

[1] Korea Inst Sci & Technol, Ceram Proc Res Ctr, Seoul 136791, South Korea

[2] Korea Inst Machinery & Mat, Mat Forming Grp, Changwon 641010, South Korea

[3] Korea Univ, Div Engn & Mat Sci, Seoul 136701, South Korea

来源：

METALS AND MATERIALS-KOREA | 1997年 / 3卷 / 03期

关键词：

D O I：

10.1007/BF03025961

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tin oxide powders of nanometer size have been synthesized by a gas condensation method using helium or a mixture of oxygen and helium as the convection gas. Changes in the average size, morphology, and crystal phases were investigated during heat treatment at temperatures between 350 degrees C and 720 degrees C in the air. Spherical tin oxide powders of 15 nm in average diameter were synthesized in a helium atmosphere, which was composed of Sn, SnO, and Sn2O3 phases. After annealing at 720 degrees C, these multiphase particles transformed to a single SnO2 phase and became an irregular shape of about 50 nm in diameter. This rapid coarsening was attributed to fast mass transfer among particles. The spherical SnO2 powder of 7 nm in average diameter was directly synthesized using a gas mixture of oxygen and helium. Upon annealing up to 720 degrees C, morphological changes were barely observed in the powder synthesized using a convection atmosphere containing oxygen.

引用

页码：188 / 192

页数：5

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