Glass formation in the Sb2O3-CdCl2-SrCl2 ternary system
Résumé
Vitreous systems based on antimony oxide Sb2O3 have been investigated. The limits for glass formation are reported in the Sb2O3-CdCl2-SrCl2 ternary system, and in the Sb2O3-SrCl2-(0.5CdCl2 + 0.5ZnCl2) pseudo ternary system. Amorphous state is confirmed by XRD patterns. Thermal measurements implemented by differential scanning calorimetry show that Tg is above 300 °C. As a general trend, Tg increases with chloride content. These glasses have an extended transmission in the mid-infrared spectrum with a refractive index larger than 2. The influence of the CdCl2/Sb2O3 substitution on the physical properties has been studied in the (90 − x)Sb2O3-xCdCl2-10SrCl2 system: thermal expansion, Vickers microhardness, Young and bulk modulus decrease as cadmium concentration increases. An inverse dependence is observed for shear modulus. This behaviour is discussed in relation to structural hypothesis.