Study of partial melting at high-pressure using in situ X-ray diffraction

D. Andrault, G. Morard, N. Bolfan-Casanova, O. Ohtaka, H. Fukui, H. Arima, N. Guignot, K. Funakoshi, P. Lazor, M. Mezouar

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The high-pressure melting behavior of different iron alloys was investigated using the classical synchrotron-based in situ X-ray diffraction techniques. As they offer specific advantages and disadvantages, both energy-dispersive (EDX) and angle-dispersive (ADX) X-ray diffraction methods were performed at the BL04B1 beamline of SPring8 (Japan) and at the ID27-30 beamline of the ESRF (France), respectively. High-pressure vessels and pressure ranges investigated include the Paris-Edinburgh press from 2 to 17 GPa, the SPEED-1500 multi-anvil press from 10 to 27 GPa, and the laser-heated diamond anvil cell from 15 to 60 GPa. The onset of melting (at the solidus or eutectic temperature) can be easily detected using EDX because the grains start to rotate relative to the X-ray beam, which provokes rapid and drastic changes with time of the peak growth rate. Then, the degree of melting can be determined, using both EDX and ADX, from the intensity of diffuse X-ray scattering characteristic of the liquid phase. This diffuse contribution can be easily differentiated from the Compton diffusion of the pressure medium because they have different shapes in the diffraction patterns. Information about the composition and/or about the structure of the liquid phase can then be extracted from the shape of the diffuse X-ray scattering.

Original languageEnglish
Pages (from-to)267-276
Number of pages10
JournalHigh Pressure Research
Volume26
Issue number3
DOIs
Publication statusPublished - 2006 Sep 1

Keywords

  • Diamond anvil cell
  • Melting
  • Multi-anvil press
  • Paris-Edinburg press
  • Synchrotron radiation

ASJC Scopus subject areas

  • Condensed Matter Physics

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