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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/37275
Title: 
Photo-induced effects in Ge25Ga10S65 glasses studied by XPS and XAS
Author(s): 
Institution: 
  • Universidade Federal do Paraná (UFPR)
  • Universidade de São Paulo (USP)
  • Universidade Estadual Paulista (UNESP)
  • Ctr Univ Paris Sud
ISSN: 
0167-2738
Abstract: 
The present paper focuses on the structural, electronic, and compositional properties of Ge25Ga10S65 glasses before and after UV illumination in air using X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) techniques. The XPS Ge 3d spectra reveal the existence of Ge-O bonds in the surface region of illuminated glass. In the case of this sample, XAS O K-edge spectra showed the formation of an enriched region of oxygen atoms in the glass bulk, indicating a different bonding structure of oxygen at the surface and in the bulk of the glass. Moreover, the structural changes that occur after UV illumination in the glass sample are identified as the formation of a homogeneous germanium oxide surface layer followed by an intermediary Ge25Ga10S65-yOz subsurface region. (c) 2005 Elsevier B.V. All rights reserved.
Issue Date: 
12-May-2005
Citation: 
Solid State Ionics. Amsterdam: Elsevier B.V., v. 176, n. 15-16, p. 1403-1409, 2005.
Time Duration: 
1403-1409
Publisher: 
Elsevier B.V.
Keywords: 
  • chalcogenide glasses
  • photo-induced effects
  • oxygen
  • XPS
  • XAS
Source: 
http://dx.doi.org/10.1016/j.ssi.2005.04.005
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/37275
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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