Abstract
The value of the second-order crystal-field coefficient A 20 has been determined as a function of the nitrogen content in Sm 2 Fe 17 N 3− δ by employing an exchange and crystal field model, in which the three lowest J-multiplets were taken into account, assuming that the role of crystal field terms higher than second-order is negligible at room temperature. A linear dependence of A 20 on δ is found with a slope of dA 20/ δ = +63 K·a 0 −2. A 20 reaches a value of -245 K· a 0 −2 for δ=0.06, which is slightly larger than that of SmCo 5. A bonding charge model (BCM) based on Pauling's chemical bond picture has been proposed here which gives a quantitative account of the effects of nitrogenation on the crystal field. The enhancement of Samarium anisotropy after nitrogenation can be explained by the Sm-N bonding.
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