Abstract
Amorphous chalcogenides may be divided among three classes based upon the changes in local order and bond type on transition from the amorphous to the crystalline phases. These types include: (I) Stoichiometric compounds which do not undergo significant changes in local order on crystallization (e.g., As2Se3). (II) Stoichiometric compounds which undergo significant changes in local order on crystallization (e.g., GeTe). (III) Non-stoichiometric alloys which phase separate on crystallization.
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