Volume 117, Number 5, March 2017
|Number of page(s)||4|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||24 April 2017|
The giant effect of magnetic ordering on a sound velocity in a σ-Fe55Cr45 alloy
1 AGH University of Science and Technology, Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30, PL-30-059 Kraków, Poland
2 ESRF-The European Synchrotron CS40220 - F-38043 Grenoble Cedex 9, France
3 National Research Center “Kurchatov Institute” - 123182 Moscow, Russia
Received: 21 January 2017
Accepted: 6 April 2017
We studied atomic dynamics of (x = 45 and 49.5) alloys using nuclear inelastic scattering of synchrotron radiation. For the σ-Fe55Cr45 alloy, the derived reduced iron partial density of phonon states reveals a huge difference in the low-energy region between magnetic and paramagnetic states. The latter implies a ∼36% increase of the sound velocity in the magnetic phase, which testifies to a magnetically induced hardening of the lattice. Estimations of the longitudinal and transverse components of the sound velocity based on theoretically calculated elastic constants for the σ-CoMo alloys imply that both components are affected by magnetism.
PACS: 63.20.dd – Measurements / 63.50.Gh – Disordered crystalline alloys / 75.50.Bb – Fe and its alloys
© EPLA, 2017
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