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
A rather large temperature would be required for diamond to carry
an 'injected' charge wouldn't it?