Charge and spin density on iron nuclei in the BCC Fe-Ga alloys studied by Mössbauer spectroscopy

Random solutions of Ga atoms in BCC iron have been studied at room temperature by means of the Mössbauer spectroscopy versus Ga concentration ranging till 37 at.%. Contributions to the iron hyperfine field and isomer shift due to individual Ga impurity have been determined up to the third nearest neighbour shell. Contributions to the hyperfine field amount to −2.02 T, −0.02 T and +0.44 T for the Ga impurity at subsequent shell, respectively. Corresponding contributions to the isomer shift are as follows: +0.036 mm/s, +0.076 mm/s and −0.002 mm/s.