The local structures of semiconductor
InSb compound have been studied by in-situ XAFS in the temperature range of 300
and 823 K. Reverse Monte Carlo calculation is used to simultaneously fit both
In and Sb K-edge EXAFS functions kχ(k) of InSb compound. The fitting results
indicate that the average bond length R1 (2.80 Å) and the average coordination
number N1 (4.0) of the first In-Sb (or Sb-In) shell of InSb (723 K) are similar
to those (2.79 Å, 4.0) of crystalline InSb (300 K) with a zinc-blende
structure, in spite of InSb compound possessing a large thermal disorder degree
at 723 K. At the temperature of 828 K (Tm(InSb) = 798 K), the R1 and N1 of the
first In-Sb shell are 2.90 Å and 5.8, and the R1 and N1 of the first Sb-In
shell are 2.90 Å, and 5.5 for molten InSb, respectively. For molten InSb (828
K), the coordination numbers of the In-Sb (or Sb-In) first shell are mostly 5
and 6, and a few percent of In-In (or Sb-Sb) coordination appears in the first
shell. It implies that the tetrahedron structures of the In-Sb (or Sb-In)
covalent bonds of InSb compound have been destroyed in the liquid state.
Source:IOPscience
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