Mössbauer Study by 57Fe and 174Yb Mössbauer Spectroscopies of Yb2Fe14B, RCo4-xFexB (R = Pr, Nd, Sm, Er, Tm, Lu) and SmFe10T2(T = Ti, V, Si)
i) Mössbauer investigation of Yb2Fe14B with 57Fe and 174Yb shows the existence of a magnetization reorientation at 115 K and provides additional information on the exchange and crystal fields acting on the R.E. ions in the R2Fe14B series. ii) In compounds of the form RCo14-xFexB, which are fert romagnetic for R = Pr, Nd, Sm (x < 2) and ferrimagnetic for R = Er, Tm, Lu, Mössbauer spectroscopy yields the magnetization direction, which depends both on the R.E. anisotropy and on the transition metal anisotropy; this last anisotropy is apparently influenced by the strong affinity of the iron for the 2c site evidenced by 57Fe Mössbauer spectra. The easy axis ferromagnet SmCo2Fe2B has interesting magnetic characteristics, iii) Samples of the new family SmFe10T2(T = Ti, V, Si) have been investigated; those containing Ti are pure phases, with an easy axis both at R.T. and at 150°C; their Curie temperature is Tc ∼ 590 K.
KeywordsMossbauer Spectroscopy Hyperfine Field Easy Axis Easy Plane Mossbauer Spectrum
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