High-pressure behaviour and equation of state of calcite, CaCO3 |
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| Authors: | Simon A T Redfern Ross J Angel |
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| Institution: | Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK; e-mail: satr@esc.cam.ac.uk, GB
Bayerisches Geoinstitut, Universit?t Bayreuth, D-95440 Bayreuth, Germany, DE
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| Abstract: | The high-pressure response of the cell parameters of calcite, CaCO3, has been investigated by single crystal X-ray diffraction. The unit cell parameters have been refined from 0 to 1.435?GPa, and the linear and volume compressibilities have been measured as β a =2.62(2)?×?10?3?GPa?1,β c =7.94(7)?×?10?3?GPa?1, β v =13.12?×?10?3?GPa?1. The bulk modulus has been obtained from a fit to the Birch-Murnaghan equation of state, giving K 0=73.46?±?0.27?GPa and V 0=367.789 ±?0.004?Å3 with K′=4. Combined with earlier data for magnesite, ankerite and dolomite, these data suggest that K 0 V 0 is a constant for the Ca-Mg rhombohedral carbonates. |
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