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As I said, I've not been taught about thermal conduction, though the principles I have outlined will have the same effect on electron mobility. Essentially, there are two extremes.
No defects, good conductivity, crap strength.
Lots of defects, crap conductivity, great strength.
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We come from opposite directions then. I just had an exam that covered how to interpret eutatic phase diagrams, but I know very little about actual material science.
Anyway I agree, defects in diamond or metals will cause a big drop in conductivity, though oddly enough its for completely different reasons.
According to a lecture I had, removing C13 from synthetic diamonds yields a 50% increase in conductivity (diamonds with conductivities beyond 3000w/mk have been made this way IIRC). I wonder how much an effect impurites have on copper . . .
One more thing, whats to stop oxygen from being taken into the crystal when you anneal? I think C101 has to be melted under special atmosphere to prevent this, though I'm only half sure of that.