The quadrupole splitting of 59 Co in Co 1- x M x Si (M=Fe, Ni) has been measured by NMR of 59 Co. It increases rapidly with increasing Fe concentration, while is independent on Ni concentration. The electric field gradient at the Co site in Co 1- x Fe x Si (0 ≦ x ≦0.13) is the same with that at Fe site determined from the measurements of 57 Fe Mössbauer effect by Wertheim et al. The results can be explained by the band electron model.
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Watanabe et al. (1979) studied this question.
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