Chalcogenides are materials containing one or more chalcogen elements as a substantial constituent. They are covalently bonded materials and, although they may be amorphous or crystalline, they are fundamentally semiconductors with a band gap typically of 1–3 eV, depending on composition. CBulk chalcogenide glasshalcogenides, are particularly noted for their functionality, with strong, varied responses to optical, electrical and thermal stimuli.
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