I'm no expert on the bonding technology used for these materials, but the plate they spoke of is actually bonded carbide, not diamond. The plate conductivity would have been weakened by the use of pure diamond, seeing as a crystalline structure invariably has gaps through which heat may not move. We've known that a highly compressed structure is best for transferring heat, what with the atoms being closer to one another. While copper is metallic, and thus really a frozen liquid at room temperature, with a jumbled up molecular structure; diamond is an ordered crystal, with intermolecular gaps. I spoke with a chemistry professor to get this info. He told me that just because the diamond was compressed carbon, did not mean that it would behave the same as carbon. I also asked about the bonding technology, but he couldn't explain it so I would understand.
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