期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 355, 期 1, 页码 54-57出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2008.03.051
关键词
Absorption; Optical spectroscopy
A comparative analysis of temperature behavior of optical absorption edge is performed for non-crystalline materials where the Urbach behavior is observed (SiO2) with deviations from the Urbach behavior (20PbO center dot 80SiO(2)) and with a mixed behavior (As2S3). For glassy As2S3, the Urbach behavior of the absorption edge in a limited temperature range is explained from the point of view of two components of structural disordering - static and dynamic. A parallel red shift of the absorption edge in As2S3 and, consequently, the temperature-independent Urbach energy at T < 300 K, are related to the lack of medium-range order in the atomic arrangement in the presence of short-range order. (C) 2008 Elsevier B.V. All rights reserved.
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