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|Type:||Artigo de evento|
|Title:||Structural Characterisation Of Cscl Incorporation In Ga2s3-la2s3 Glasses|
|Abstract:||We report X-ray absorption spectroscopy study of (80 - x)Ga2S3-20La2S3-xCsCl glasses, with x = 0-40. The addition of CsCl to Ga2S3-La2S3 glasses increases their thermal stability making them suitable a host-matrix for luminescent rare earth ions. The gallium-based network is composed of almost regular tetrahedra of sulfur atoms connected by corners. The average local lanthanum site is a distorted polyhedron of sulfur atoms at a distance of 2.96 ± 0.01 Å, with a coordination number close to 7. There is no alteration in the local environment of these elements in the doped glasses with respect to the undoped one detected in the X-ray absorption spectra. The chlorine and cesium sites, as observed in the X-ray absorption spectra, are similar to that in CsCl. These experimental observations are compatible with a model in which these elements are incorporated in network ionic vacancies in the form of CsCln units. © 2002 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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