Further evidence on the effect of magnetism on lattice vibrations:the case study of sigma-phase Fe0.525Cr0.455Ni0.020 alloy

TL;DR

This study investigates how magnetism influences lattice vibrations in a sigma-phase Fe-Cr-Ni alloy using Mössbauer spectrometry, revealing deviations from the Debye model below 50 K due to magnetic effects.

Contribution

It provides experimental evidence of magnetic effects on lattice dynamics in sigma-phase alloys, highlighting deviations from classical models at low temperatures.

Findings

Significant deviation of <CS> from Debye model below 50 K

Magnetism affects lattice vibrations in the alloy

Debye temperature estimated at 437(7) K

Abstract

Sigma-phase Fe0.525Cr0.455Ni0.020 alloy was studied by means of M\"ossbauer spectrometry in the temperature range of 5-293 K. The average center shift, <CS>, determined from the recorded M\"ossbauer spectra was shown to significantly deviate from the Debye model in the temperature range below ca. 50 K i.e. in the magnetic state of the sample. The deviation is obviously due to the effect of magnetism on the lattice dynamics of the studied sample. Analysis of the <CS>-data in the paramagnetic phase in terms of the Debye model yielded the value of 437(7) K for the Debye temperature.