Since there is no mention of crystallography, one can assume these are
cubic diamonds in which the extra annealing cycle simply reduces the
defect density which could, however, also improve the hardness of
natural diamond. What was the as formed hardness??? I wonder if they
formed any hexagonal or rhombohedral phases.
Here are some other tidbits along similar lines. This form of
graphite is quite interesting, it rivals the hardness of diamond yet
has a significant improvement in fracture toughness. (it cracked the
Here's another one: Osmium metal has a higher modulus than diamond,
interesting discovery since ultrahard materials with low
compressability are typically covalent bonded ceramics.
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