Sep 12 – 17, 2010
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Debye temperature of sigma-phase Fe-V alloys

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium


CH - 1211 Geneva 23 Switzerland
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POSTER Lattice Dynamics, Ion-Solid Interaction


Prof. Stanislaw Dubiel (AGH University of Science and Technology)


Among about 50 examples of a sigma-phase (tetragonal unit cell - structure type D144h P42/mnm) known to exist in binary alloy systems the one in FeV is of particular importance due to a wide composition-temperature range in which s can be formed as well as to the strongest magnetism it shows [1]. The former offers favourable conditions for investigation of compositional dependence of various physical properties as well as testing various theoretical models. This contribution reports on Debye temperatures determined from a temperature dependence of the average centre shift, based on the Debye model, for a series of the sigma-phase Fe(100-x)V(x) samples with 34.4 < x < 59.0. As found, dependence of the Debye temperature on x is not monotonous, but two minima – one at x = 40 and the other at x = 48 – and a maximum at x = 43 are observed. Such behaviour and the fact that the amplitude of a change in the Debye temperture reaches ~40% is unexpected and it is quite puzzling. The behaviour will be discussed in a context of influence of composition on other physical properties characteristic of the samples such as Curie temperature, average isomer shift and average magnetic moment per Fe atom. [1] J. Cieślak, B. F. O. Costa, S. M. Dubiel, M. Reissner , W. Steiner, J. Magn. Magn. Mater. 321 (2009) 2160
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Primary author

Prof. Stanislaw Dubiel (AGH University of Science and Technology)


Dr Benilde Costa (University of Coimbra) Dr Jakub Cieslak (AGH University of Science and Technology) Prof. Michael Reissner (Vienna University of Technology) Prof. Walter Steiner (Vienna University of Technology)

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