GRAIN BOUNDARIES HARDER THAN DIAMOND

B. Pal/osz and W. L/ojkowski
High Pressure Researc Center, Polish Academy of Sciences
Sokolowska 29, 01-142 Warsaw
Abstract
In the present paper we present some experimental results concerning
pecularities of interfaces in covalent materials subjected to high
pressure. We review experimental results pointing at the fact that
breaking of the covalent interatomic bonds may lead to denser packing
of atoms than in the bulk. These results indicate that breaking of the
covalent bonds may have at least two important consequences for the
properties of covalent materials with interfaces. On the example of
own results we show that interfaces after breaking the bonds may have
a lower compressibility than the bulk diamond. On the other hand, we
review the results of Azis et al., where breaking of interatomic bonds
may lead to negative activation volumes for some kinetic phenomena.

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