5 7Fe Mössbauer spectroscopy study of the magnetic properties of R2Fe14B compounds (R=Ce, Nd, Gd, Y)

Abstract

⁵⁷Fe Mössbauer spectra were taken at 25 and 293 K on four representative specimens of compounds of the series R₂Fe₁₄B (R=Ce, Nd, Gd, and Y). In all these cases it proved possible to analyze the spectra in terms of six subspectra associated with the six crystallographically nonequivalent Fe sites in the tetragonal R₂Fe₁₄B unit cell. Assuming a linear relation between the observed hyperfine fields and magnetic moments it follows from our analysis that, although the average Fe moment in R₂Fe₁₄B is equal to that of α‐Fe, there are Fe sites that give rise to moments much higher and much lower than the average value of 2.2 μ_B/Fe.