The effects of some heat treatments under various atmospheres (vacuum, As, Ga2O3, or H2) on GaAs : Cr samples have been investigated by EPR. The equilibria between the two valence states Cr+ and Cr2+ seem to depend on various parameters such as the total amount of Cr, and other defects such as the iron contaminant. A new paramagnetic defect, occurring at g=2.002±0.001 has been identified, whose intensity is highest after the H2 anneal.
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Goltzené et al. (1979) studied this question.
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