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Re: [Phys-l] Transparency

On Oct 10, 2008, at Oct 10(Fri) 4:49 , John Denker wrote:
All this is discussed at

quoted from the above:
.......a real practical insulator is totally different from the hogwash explanation (large-gap semiconductor) given in almost all solid-state physics books. A large-gap semiconductor should be called merely a semi-non-conductor, since it cannot be used as a practical insulator. It will not immobilize any charge injected onto or into it.

How does diamond fit into this 'insulator not= large gap semiconductor'
A rather large temperature would be required for diamond to carry an 'injected' charge wouldn't it?