Influence of grain size on the vibrational properties in Mn2O3 nanocrystals

被引：45

作者：

Chen, Z. W. ^{[1
]}

Lai, J. K. L. ^{[1
]}

Shek, C. H. ^{[1
]}

机构：

[1] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2006年 / 352卷 / 30-31期

关键词：

crystal growth; nanocrystals; Raman scattering; optical spectroscopy; TEM/STEM; nanoparticles; infrared properties; Raman spectroscopy;

D O I：

10.1016/j.jnoncrysol.2006.04.011

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of grain size on the vibrational properties of Mn2O3 nanocrystals has been investigated by transmission electron microscopy, Raman and infrared (IR) spectroscopy. It is found that the vibrational properties are sensitively dependent on the grain sizes of Mn2O3 nanocrystals. Raman spectra studies indicate that with decreasing grain sizes, allowing the transition of phonons with q not equal 0 contributes to the Raman spectrum, which leads to the broadening of the Raman peaks in the lower frequency region. IR spectra exhibit the remarkable differences in the shapes with different grain sizes of Mn2O3 nanocrystals. The shape of the band in the 570-670 cm(-1) ranges is strongly evocative of transverse-optical (TO) and longitudinal-optical (LO) splitting. This splitting appears more and more clear with the decreasing grain size of Mn2O3 nanocrystals. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：3285 / 3289

页数：5

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