Structure and elasticity of cubic Fe-Si alloys at high pressures

E. Edmund, D. Antonangeli, F. Decremps, G. Morard, S. Ayrinhac, M. Gauthier, E. Boulard, M. Mezouar, M. Hanfland, and N. Guignot
Phys. Rev. B 100, 134105 – Published 22 October 2019
PDFHTMLExport Citation

Abstract

Using a combination of picosecond acoustics and synchrotron x-ray diffraction, the sound velocities and equations of state of Fe-Si alloys have been determined over a wide range of compositions (10–29 at. % Si) and pressures (up to 65 GPa) under quasihydrostatic conditions. We observe marked variation in the elastic properties of the alloys depending on synthesis method and degree of Si ordering. In particular, it is observed that there is a sharp change in the density dependence of the sound velocities which coincides with the observation of long-range ordering by diffraction methods. This change in elasticity is probably due to a change in bond character of the Fe-Si alloy. Furthermore, the bcc-hcp transition in these alloys has been mapped to high pressures and Si contents. We observed that the onset of the transition changes by more than 6 GPa per at. % for alloys containing more than 15 at. % Si.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 5 August 2019
  • Revised 23 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.134105

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

E. Edmund*, D. Antonangeli, F. Decremps, G. Morard, S. Ayrinhac, M. Gauthier, and E. Boulard

  • Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, UMR CNRS 7590, IRD, Muséum National d'Histoire Naturelle, Paris 75005, France

M. Mezouar and M. Hanfland

  • ESRF, Grenoble 38000, France

N. Guignot

  • Synchrotron SOLEIL, Saint-Aubin 91192, France

  • *eric.edmund@upmc.fr

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 100, Iss. 13 — 1 October 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×