Changes in the 119 Sn‐site hyperfine field of iron induced by substitutional vanadium and chromium

The effect of substitutional vanadium (up to 18 at%) and chromium (in the whole composition range) on the average 119 Sn‐site hf field, H Sn , in metallic iron is investigated using Mössbauer‐effect spectroscopy. From the room temperature measurements for both the impurities it is observed that H Sn falls with increasing impurity content much faster than the corresponding 57 Fe‐site hf field. For chromium H Sn is a nonlinear function of impurity concentration and indicates the following four characteristic ranges: up to x ≈ 10 d H Sn /d x ≈ 390 kOe; for 10 ≦ x ≦ 45 d H Sn /d x ≈ ≈ 11 kOe; for 45 ≦ x ≦ 65 d H Sn /d x ≈ 210 kOe; at x = 72 H Sn ≈ 0 and for x ≧ 72 H Sn increases with x in a nonlinear way. From the 4.2 K measurements for iron–chromium alloys it follows that H Sn passes through a minimum of 27 kOe at x = 83, but it does not compensate completely. This concentration coincides with the spin‐glass state concentrations x = 81 to 84.