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Abstract
When thin-foil specimens of InSb are heated in the vacuum of an electron microscope, a depletion of Sb takes place because of the preferential evaporation of Sb. This results in the formation of a novel non-stoichiometric (In-rich) solid phase having a cubic structure with a lattice parameter of 5·9 Å, which is about 10% smaller than that of InSb. It has been shown that the twin-orientation relationship exists between the matrix and the non-stoichiometric phase.