Optical pumping of electrons in the non-magnetic alloys Hgo,,,Cdo,69Te and Hgo.mCdo.61Te at 4.2 K was studied by circularly polarized excitation with photon energy somewhat higher than the energy gap and compared with optical pumping efficiency for the semi-magnetic alloy Hgo.nM%.23Te wilh Intermediate values of the band parameter. Spin relaxation times were estimated for semimagnetic and non-magnetic alloys. The experimental values were compared with the theory of spin relaxation of electrons in semiconductors. The mechanism of spin relaxation in non-magnetic alloys with 0.61

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The low temperature (2K) photoluminescence of gallium antimonide doped by iron have been studied at a zero magnetic field. The samples were prepared by the float-zone method. The concentration of Fe in the melt was in the range of 0.001 -1 atomic percent. The samples had a p-type of conductivity and it was shown that the Fe in GaSb formed the shallow acceptor level with the ionization energy of 23 ± 2 meV. The concentration of shallow acceptors determined from the Hall measurements is in a good agreement with the concentration of the Fe acceptors obtained from the photoluminescence.

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