Abstract
AbstractThe iron impurity atom state in GaAs and GaP is studied by emission Mössbauer spectroscopy. The iron atoms substitute for gallium atoms and have a tetrahedral surrounding. The electron configuration for a neutral state of these centres (Fe)° is 3d54s0.52p1.56 (in GaAs) or 3d54s0.79p2.37 (in GaP), while in the ionized state the population of the 3d shell of iron is increased (3d6). The process of fast electron exchange via the valence band between the (Fe)° and (Fe)− centres at 295 K is observed in slightly overcompensated GaP. For E(Fe) – E(Co) a value of – (0.035 ± 0.002)eV is obtained where E(Fe) and E(Co) are the iron and cobalt levels in GaP, respectively.
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