Measurements of Rayleigh–Taylor instability growth of laser-shocked iron–silicon alloy

Tatsuhiro Sakaiya, Hidenori Terasaki, Kosaku Akimoto, Hiroki Kato, Taichi Ueda, Ryota Hosogi, Takashi Fujikawa, Tadashi Kondo, Yoichiro Hironaka, Keisuke Shigemori

Research output: Contribution to journalArticlepeer-review

Abstract

The Rayleigh–Taylor (RT) instability of liquid iron alloys is important for understanding the core formation mechanism in the Earth. Here we first report the measurement of RT instability growth for a liquid iron–silicon (Fe–Si) alloy, which is one of the major candidate for the material of the Earth’s core, using a high power laser. We optimized the measurement setup and analytical technique to observe the growth of perturbation on an Fe–Si sample surface. The growth of perturbation amplitude on the Fe–Si alloy under high pressure and temperature was successfully observed using in situ X-ray radiography. The growth rate of the RT instability for the Fe–Si alloy on about 1000 GPa was estimated to be 0.3 ns −1 .

Original languageEnglish
Pages (from-to)150-159
Number of pages10
JournalHigh Pressure Research
Volume39
Issue number1
DOIs
Publication statusPublished - Jan 2 2019
Externally publishedYes

Keywords

  • Earth’s core
  • Iron alloy
  • Rayleigh–Taylor instability
  • X-ray radiography
  • laser

ASJC Scopus subject areas

  • Condensed Matter Physics

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