Structural characterisation of CsCl incorporation in Ga 2S 3-La 2S 3 glasses
Abstract
We report X-ray absorption spectroscopy study of (80- x)Ga 2S 3-20La 2S 3- xCsCl glasses, with x=0-40. The addition of CsCl to Ga 2S 3-La 2S 3 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 CsCl n units.
- Publication:
-
Journal of Non Crystalline Solids
- Pub Date:
- June 2002
- DOI:
- 10.1016/S0022-3093(02)01020-7
- Bibcode:
- 2002JNCS..304..182R