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Magnetic ordering above room temperature in the sigma-phase of Fe66V34

Authors: Jakub Cieslak, Benilde F. O. Costa, Stanislaw M. Dubiel, Michael Reissner and Walter Steiner

Ref.: J Magn Magn Mat 321, 2160-2165 (2009)

Abstract: Magnetic properties of four sigma-phase Fe100-xVx samples with 34.4 <= x <= 55.1 were investigated by Mossbauer 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, = 0.89 mu(B), and Curie temperature, T-C = 315.3 K. The quantities were shown to be strongly correlated with each other. In particular, T-C is linearly correlated with with a slope of 406.5 K/mu(B), as well as < B > is so correlated with , yielding 14.3 T/mu(B) for the hyperfine coupling constant. (C) 2009 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.jmmm.2009.01.005