The structure of As3Se5Te2 infrared optical glass
Résumé
The structure of As3Se5Te2 infrared optical glass was investigated by X-ray and neutron diffraction as well as extended X-ray absorption fine structure measurements at the As-, Se- and Te K-edges. The five datasets were modelled simultaneously by the reverse Monte Carlo simulation technique. Experimental data could be fitted satisfactorily by allowing As-Se, As-Te and Se-Te bonds only. It was revealed that the affinity of As is much higher to Se than to Te. The nearest As-Se distance is similar to that found in other vitreous As-Se based alloys, while the As-Te bond length is 0.02-0.04 Å shorter in As3Se5Te2 than in binary As-Te glasses.