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氧化锡超微粒的纳米结构、化学稳定性与反常相变

林光明; 刘文浩; 郑裕芳   

  1. 中山大学物理系; 广州510275
  • 收稿日期:1996-06-19 修回日期:1996-10-08 出版日期:1997-08-20 网络出版日期:1997-08-20

Nanostructure,Chemical Stability and Abnormal Transformation in Ultrafine Particles of Oxidized Tin

LIN Guangming; LIU Wenhao; ZHENG Yufang   

  1. Department of Physics; Zhongshan University Guangzhou 5100275 China
  • Received:1996-06-19 Revised:1996-10-08 Published:1997-08-20 Online:1997-08-20

摘要: 采用低氧压下惰性气体沉积法制备粒经6nm以下的氧化锡微粒.由XRD、TEM及穆斯堡尔谱分析测定它的超精细参数、化学稳定性及加热过程发生的相变.结果表明,超微粒的纳米结构由体相和表面相组成;在室温下自发氧化形成稳定的二氧化锡.经300~600℃热处理后,产生正交与四方SnO2相.分析认为,正交SuO2相可能是在缺氧条件下,无序SnO2相向高温稳定四方相转变的中间产物.

关键词: 氧化锡, 超微粒子, 穆斯堡尔谱, 正交SnO2, 超精细参数

Abstract: Ultrafine oxidized tin particles with particle size about 6nm were prepared by inert gas condesation deposition under low oxygen pressure.
The nanostructure, hyperfine parameters and chemical stability were studied by means of TEM, XRD especially by Mossbauer spectra analysis.
Results show that, the nanostructure of particles can be divided into crystal component and disorder component. Nano-powders have high chemical
activity and can be oxidezed into stable SnO2 compound at ambient temperature. XRD measurements show, post-annealing at temperature of 300~
600℃ for 2h in air produces orthorhombic and tetragonal SnO2 phases. Orthorhombic SnO2 phase may be an intermediate phase while disorder SnO2
transforms to high temperature stable tetragonal SnO2 (rutile) under oxygen deficiency condition.

Key words: tin oxide, ultrafine particle, Mossbauer spectrum, orthorhombic SnO2 phase, hyperfine parameters