期刊
MATERIALS LETTERS
卷 60, 期 16, 页码 2013-2016出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2005.12.070
关键词
ferric oxide; particle size effects; infrared luminescence
A weak near-infrared luminescence has been observed for fine-particle Fe2O3 when excited by 1064 nm radiation from a Nd:YAG laser. There are three broad luminescence peaks at 7994, 7225 and 6686 cm(-1), with intensities about 10 times that of the Raman scattering. The relative intensities vary with particle morphology and with heat treatment. Overall band intensities increase by about a factor of 10 for Fe2O3 that has been heated to 500 degrees C and the decreases again for material that has been heated to 1000 degrees C. The emission was assigned to the T-4(1g) -> (6)A(1g) crystal field transition of octahedral Fe3+. A large Stokes shift is associated with these transitions. (c) 2005 Elsevier B.V. All rights reserved.
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