Abstract
A new class of non-oxide glasses with the general composition CsAXY 2 (A Al, Ga; X S, Se; Y Cl, Br) has been isolated and characterized. Raman spectroscopy, investigations of the I.R. multiphonon edge, Differential Thermal Analysis measurements show that these glasses contain a giant polymeric tetrahedra-based anion and have a good stability towards devitrification. Their chemical durability in normal atmosphere is very poor and affects severely their optical properties, specially in the I.R. multiphonon region.
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