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Homework Help: Good thermal but poor electrical?

  1. Aug 28, 2007 #1
    1. What are the only two materials that are good thermal conductors but poor electrical conductors? I think all metals follow the Wiedemann-Franz Law.

    Diamond is, I believe, one of them.
     
  2. jcsd
  3. Aug 28, 2007 #2

    mgb_phys

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    Sapphire isn't bad - Diamond is the best.
     
  4. Aug 28, 2007 #3

    Astronuc

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