Q: Transparency in phase change alloys

  • Thread starter rich_mmiv
  • Start date

I was wondering if anyone could explain the following:
The technology behind CD-RW discs relies upon phase change alloys usually comprising of indium, silver, tellurium, and antimony. These are translucent in their crystalline state but opaque in their amorphous state. I understand why glass - an amorphous material, is largely transparent, but why is this alloy 'the other way round' - how is it that the crystalline state is translucent?
Any answer would be gratefully received.


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