Phase diagram of calcium at high pressure and high temperature

S. Anzellini*, D. Errandonea, S. G. MacLeod, P. Botella, D. Daisenberger, J. M. De'Ath, J. Gonzalez-Platas, J. Ibanez, M. I. McMahon, K. A. Munro, C. Popescu, J. Ruiz-Fuertes, C. W. Wilson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Resistively heated diamond-anvil cells have been used together with synchrotron x-ray diffraction to investigate the phase diagram of calcium up to 50 GPa and 800 K. The phase boundaries between the Ca-I (fcc), Ca-II (bcc), and Ca-III (simple cubic, sc) phases have been determined at these pressure-temperature conditions, and the ambient temperature equation of state has been generated. The equation of state parameters at ambient temperature have been determined from the experimental compression curve of the observed phases by using third-order Birch-Murnaghan and Vinet equations. A thermal equation of state was also determined for Ca-I and Ca-II by combining the room-temperature Birch-Murnaghan equation of state with a Berman-type thermal expansion model.

Original languageEnglish
Article number083608
Number of pages8
JournalPhysical Review Materials
Volume2
Issue number8
DOIs
Publication statusPublished - 30 Aug 2018

Keywords

  • ALKALINE-EARTH METALS
  • X-RAY-DIFFRACTION
  • EQUATION-OF-STATE
  • TRANSITIONS
  • SYNCHROTRON

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