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J. Cieslak, B.F.O. Costa, S.M. Dubiel, M. Reissner, W. Steiner:
"Magnetic ordering above room temperature in the sigma-phase of Fe₆₆V₃₄";
Journal of Magnetism and Magnetic Materials, 321 (2009), 2160 - 2165.

Magnetic properties of four sigma-phase Fe100−xVx samples with 34.4x55.1 were investigated by Mössbauer spectroscopy and magnetic measurements in the temperature interval 4.2-300 K. Four magnetic quantities, viz. hyperfine field, Curie temperature, magnetic moment and susceptibility, were determined. The sample containing 34.4 at% V was revealed to exhibit the largest values found up to now for the sigma-phase for average hyperfine field, B=12.1 T, average magnetic moment per Fe atom, μ=0.89 μB, and Curie temperature, TC=315.3 K. The quantities were shown to be strongly correlated with each other. In particular, TC is linearly correlated with μ with a slope of 406.5 K/μB, as well as B is so correlated with μ, yielding 14.3 T/μB for the hyperfine coupling constant.

http://dx.doi.org/10.1016/j.jmmm.2009.01.005

http://dx.doi.org/10.1016/j.jmmm.2009.01.005