Title

Surface Sulphination Of Germanium Oxide Based Materials

Abstract

The effect of oxygen substitution for sulphur has been investigated in germanium and boron based glasses containing heavy metal oxides (Sb 2O3). After heat treatment under H2S flow, the colour of the glass (powder and bulk) changes from colourless to yellowish indicative of union exchange. The oxygen substitution for sulphur has been confirmed by the presence of a new Raman band located at 340 cm-1 corresponding to a Ge-S and Sb-S bond vibration. The influence of the borate addition has been studied. XPS measurements have shown (i) the oxidation of Sb3+ to Sb5+ during the melting which increases with an increase of boron content and (ii) the reduction of Sb5+ to Sb 3+ during the sulphination, resulting in the departure of more than one oxygen union upon replacement by one sulphur und in the absence of weight gain. It has been clearly demonstrated that sulphination near the oxide glass transition temperature can lead to the formation of oxysulphide glass materials.

Publication Date

12-1-2004

Publication Title

Physics and Chemistry of Glasses

Volume

45

Issue

6

Number of Pages

315-321

Document Type

Article

Personal Identifier

scopus

Socpus ID

13544250818 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/13544250818

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