By the same authors

From the same journal

Phase Transition Lowering in Dynamically Compressed Silicon

Research output: Contribution to journalArticle

Full text download(s)

Published copy (DOI)

Author(s)

  • Emma E. McBride
  • A. Krygier
  • A Ehnes
  • Eric Galtier
  • M. Harmand
  • Z Konôpková
  • H. J. Lee
  • H. P. Liermann
  • Bob Nagler
  • Alexander Pelka
  • M. Rödel
  • Andreas Schropp
  • R. F. Smith
  • C. Spindloe
  • D. C. Swift
  • F. Tavella
  • S. Toleikis
  • T. Tschentscher
  • Justin S Wark
  • Andrew Higginbotham

Department/unit(s)

Publication details

JournalNature Physics
DateAccepted/In press - 22 Aug 2018
DateE-pub ahead of print - 24 Sep 2018
DatePublished (current) - 1 Jan 2019
Issue number1
Volume15
Number of pages6
Pages (from-to)89–94
Early online date24/09/18
Original languageEnglish

Abstract

Silicon, being one of the most abundant elements in nature, attracts wide-ranging scientific and technological interest. Specifically, in its elemental form, crystals of remarkable purity can be produced. One may assume that this would lead to silicon being well understood, and indeed, this is the case for many ambient properties, as well as for higher-pressure behaviour under quasi-static loading. However, despite many decades of study, a detailed understanding of the response of silicon to rapid compression—such as that experienced under shock impact—remains elusive. Here, we combine a novel free-electron laser-based X-ray diffraction geometry with laser-driven compression to elucidate the importance of shear generated during shock compression on the occurrence of phase transitions. We observe lowering of the hydrostatic phase boundary in elemental silicon, an ideal model system for investigating high-strength materials, analogous to planetary constituents. Moreover, we unambiguously determine the onset of melting above 14 GPa, previously ascribed to a solid–solid phase transition, undetectable in the now conventional shocked diffraction geometry; transitions to the liquid state are expected to be ubiquitous in all systems at sufficiently high pressures and temperatures.

Bibliographical note

This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

Discover related content

Find related publications, people, projects, datasets and more using interactive charts.

View graph of relations