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Bill's comments are in general excellent. But I take issue with one.
Aluminum is an electron conductor, not a hole conductor. It is used to dope
Si - to make it p-type.
In ceramics, there is often more than one charge carrier that contributes to
the electrical conduction. Here, a term called the transference number is
used to define the fraction of the total conductivity that each type of
charge carrier contributes.