Diamond, however, does not require such pressures to be synthesized. Diamond can be grown epitaxially with the same gear that's used
for ordinary semiconductors. It's done at pressures that are in the realm of vacuum technology. Calling diamond an extended solid doesn't even fit the
definition you yourself quoted at the beginning of the thread, that identifies "extended solids" with "high pressure phases". It has high-strength
covalent bonds, yes, but the origin of those bonds doesn't require high pressure by any means.
I don't know of any of these "extended solids" that are stable at STP. That document you cited doesn't have any examples of them. The CO2 phases that
illustrate high-pressure phases, all of which do have different crystal and bond structures, do indeed fit the definition of extended solids, but they
aren't stable at STP. Got any others to propose? |