Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..124...71a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 124, Issue 1-2, p. 71-79.
Physics
5
Scientific paper
The compressional behaviour of coesite has been determined to a maximum pressure of 9.6GPa by room-temperature single-crystal X-ray diffraction measurements on three crystals selected from two different synthetic samples. There is no evidence for any phase transitions in this pressure range. The new direct measurements show that coesite is approximately 1% denser at 9-10GPa (at room temperature) than predicted by extrapolation of the previously reported EoS. The volume-pressure data of all three samples cannot be adequately described by any available third-order equation of state. Refined parameters for a fourth-order Birch-Murnaghan EoS are KT0=100.8+/-0.5GPa, KT0'=1.8+/-0.3 and KT0''=0.57+/-0.06GPa-1. The anomalous positive value of KT0'' appears to be related to the anomalous compression of the c-axis of the structure that exhibits an initial softening with increasing pressure. At pressures in excess of 8GPa the bulk modulus of coesite is some 20GPa less than that previously predicted, and the impedence contrast between coesite and stishovite is therefore some 10% greater than would have been estimated on the basis of the previous EoS parameters.
Angel Roger J.
Mosenfelder Jed L.
Shaw Cliff S. J.
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