Abstract: Chalcogenide glass-ceramic having, for example, the following composition GeSe2—Sb2Se3—CuI, this glass-ceramic comprising at least one crystalline phase, characterised in that the crystallisation rate and the dimensions of the crystals in the crystalline phase are such that the crystals are substantially in contact with each other in such a way that this crystalline phase has an electrical conductivity greater than or equal to 10?4 s·cm?1 which increases under lighting due to the creation of charge carriers within the crystalline phase.

Abstract: Chalcogenide glass-ceramic having, for example, the following composition GeSe2—Sb2Se3—CuI, this glass-ceramic comprising at least one crystalline phase, characterised in that the crystallisation rate and the dimensions of the crystals in the crystalline phase are such that the crystals are substantially in contact with each other in such a way that this crystalline phase has an electrical conductivity greater than or equal to 10?4 s·cm?1 which increases under lighting due to the creation of charge carriers within the crystalline phase.

Abstract: A process is provided for obtaining a glassy material that is optically transparent to infrared radiation. The process includes: a step of amorphization, by mechanosynthesis, of an assembly of starting elements including at least one metallic element and at least one chalcogenide element, making it possible to form an amorphous powder; a step of hot densification, in a mould of predetermined dimensions, of the amorphous powder, making it possible to obtain a glass; and heat treatment, carried out during or after the hot densification step, in which the glass is heated to a temperature at which a portion of the glass is converted from an amorphous state to a crystalline state, making it possible to obtain, after cooling, a glass-ceramic.