The Mössbauer study of Nd?Fe?Co?B permanent magnetic alloys

Sintered Nd₁₇ (Fe_1?x Co_x)₇₅B₈ permanent magnetic alloys have been studied by Mössbauer effect, X-ray diffraction and electron probe micro-analysis, The results show that the alloys are composed of the tetragonal phase Nd₂(Fe,Co)₁₄B, the B-rich phase Nd₁₁₁(Fe,Co)₄B₄ and the Nd-rich phase Nd₈₀(Fe,Co)₁₉B. In the tetragonal phase, Co atoms occupy preferentially the k₂ and j₂ sites, and Fe atoms occupy randomly the k₁ site and preferentially the j₁ site while the e and c sites seem to be completely occupied by Fe atoms.