期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 42, 期 2, 页码 239-242出版社
WILEY-BLACKWELL
DOI: 10.1002/jrs.2762
关键词
maghemite; Raman spectroscopy; laser irradiation; phase transition; hematite
类别
资金
- Collectivites Locales, Le Mans Metropole - Departement de la Sarthe
- Centre de Competence C'Nano Nord-Ouest
The nature of the physical mechanisms responsible for the structural modification of the gamma-Fe2O3 nanoparticles under laser irradiation has been investigated by Raman spectroscopy. In situ micro-Raman measurements were carried out on as-prepared gamma-Fe2O3 nanoparticles about 4 nm in size as a function of laser power and on annealed gamma-Fe2O3 particles. A baseline profile analysis clearly evidenced that the phase transition from maghemite into hematite is caused by local heating due to laser irradiation with an increase of grain size of nanoparticles. This increasing was clearly determined by X-ray diffraction from 4 nm in nanoparticles up to more than 177 nm beyond 900 degrees C in a polycrystalline state. Copyright (C) 2010 John Wiley & Sons, Ltd.
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