Phase diagram of calcium at high pressure and high temperature

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URI: https://hdl.handle.net/10902/32987
ISSN: 2475-9953
ISSN: 2476-0455
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Autoría
Anzellini, S.; Errandonea, Daniel; MacLeod, Simon G.; Botella Vives, P.; Daisenberger, D.; De'Ath, J. M.; González Platas, J.; Ibañez, J.; McMahon, M. I.; Munro, K. A.; Popescu, Catalin; Ruiz Fuertes, JavierAutoridad Unican; Wilson, C. W.
Fecha
2018-08-30
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© American Physical Society
Publicado en
Physical Review Materials, 2018, 2(8), 083608
Editorial
American Physical Society
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Resumen/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.
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