Phase diagram of calcium at high pressure and high temperature

DOI: 10.1103/PhysRevMaterials.2.083608

Authors: S. Anzellini (Diamond Light Source; CEA) , D. Errandonea (Universidad de Valencia) , Simon Macleod (AWE; The University of Edinburgh) , P. Botella (Luleå University of Technology) , D. Daisenberger (Diamond Light Source) , J. M. De’ath (AWE) , J. Gonzalez-platas (Universidad de La Laguna) , J. Ibáñez (Institute of Earth Sciences Jaume Almera) , M. I. Mcmahon (The University of Edinburgh) , K. A. Munro (The University of Edinburgh) , C. Popescu (CELLS-ALBA Synchrotron Light Facility) , J. Ruiz-fuertes (Universidad de Cantabria) , C. W. Wilson (AWE)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Physical Review Materials , VOL 2

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 15864

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.

Journal Keywords: Phase transitions; Pressure effects; Structural properties

Subject Areas: Materials, Physics


Instruments: I15-Extreme Conditions

Other Facilities: ALBA