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

Abstract

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

LIN Guangming,LIU Wenhao,ZHENG Yufang. Nanostructure,Chemical Stability and Abnormal Transformation in Ultrafine Particles of Oxidized Tin[J]. Journal of Inorganic Materials.

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

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