Verres formes par les sulfures L2S3 des terres rares avec le sulfure de gallium Ga2S3

Formation of glasses in the systems L 2 S 3 Ga 2 S 3 (L = Y and La to Er, and La to Er, except Eu). Conditions of preparation. Extent of the glassy regions as a fonction of the quenching temperatures and of the rare earth element. Crystallisation by heating: vitreous transition temperature Tg, and crystallisation temperature Tc. Mechanism of crystallisation. Preliminary study of the absorption spectra.