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On the Debye temperature in sigma-phase Fe-V alloys

Authors: J. Cieslak, M. Reissner, S.M. Dubiel, B.F.O. Costa, W. Steiner

Ref.: Intermetallics 18, 10.1016/j.intermet.2010.05.010-000279953000039 (2010)

Abstract: A series of a-phase Fe(100-x)V(x) samples with 34.4 <= x <= 59.0 were investigated by neutron and X-ray diffraction and Mossbauer spectroscopy (MS) techniques. The first two methods were used for verification of the transformation from alpha to sigma phase and they also permitted to determine lattice parameters of the unit cell. With MS the Debye temperature, Theta(D), was evaluated from the temperature dependence of the centre shift, < CS >, assuming its entire temperature dependence originates from the second-order Doppler shift. To our best knowledge, it is the first ever-reported study on Theta(D) in sigma-FeV alloys. Both lattice parameters i.e. a and c were revealed to linearly increase with x. Theta(D) shows, however, a non-monotonic behaviour as a function of composition with its extreme values between similar to 425 K for x approximate to 40 and similar to 600 K for x approximate to 60. A local maximum of similar to 525 K was found to exist at x approximate to 43. (C) 2010 Elsevier Ltd. All rights reserved.

DOI: 1695