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Q: Transparency in phase change alloys

  1. Oct 25, 2004 #1
    Hi,

    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.

    Thanks.
     
  2. jcsd
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