Nanomicrostructure, chemical stability and abnormal transformation in ultrafine particles of oxidized tin

被引：58

作者：

Shek, CH ^{[1
]}

Lai, JKL ^{[1
]}

Lin, GM ^{[1
]}

Zheng, YF ^{[1
]}

Liu, WH ^{[1
]}

机构：

[1] ZHONGSHAN UNIV,DEPT PHYS,GUANGZHOU 510275,PEOPLES R CHINA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1997年 / 58卷 / 01期

关键词：

nanostructures; oxides; Mossbauer effect; crystal structure; phase transitions;

D O I：

10.1016/S0022-3697(96)00112-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ultrafine oxidized tin particles with particle size about 6 nm have been prepared by inert gas condensation deposition under low oxygen pressure. The nanostructure, hyperfine parameters, and chemical stability of the particles have been studied by means of TEM, XRD and Mossbauer spectra analysis. The results show that the nanostructure of particles can be divided into a crystalline component and a disordered component. Nano-powders have high chemical activity and can be oxidized into stable SnO2 compounds at ambient temperature. XRD measurements indicate that post-annealing at temperatures of 300-600 degrees C for 2 h in air produced orthorhombic and tetragonal SnO2 phases. Orthorhombic SnO2 phase may be an intermediate phase during the transformation of disordered SnO2 to tetragonal SnO2 (rutile) which is the high temperature stable phase under oxygen deficiency conditions. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：13 / 17

页数：5

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