Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..729s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Oct. 1985, p. 729-732.
Physics
39
Garnets, Perovskites, Phase Transformations, Synchrotron Radiation, X Ray Analysis, Diffraction Patterns, Phase Diagrams
Scientific paper
The garnet-perovskite phase transformation in CaGeO3 was investigated in the pressure-temperature region to 6.5 GPa and 1200 C, using a cubic anvil type of high-pressure apparatus combined with synchrotron radiation. In-situ measurements with an energy dispersive X-ray diffraction system enable us to carry out dynamical observation of the transformation. The equilibrium phase boundary between the garnet and perovskite phases was determined as P(GPa) = 6.9-0.0008T(C). The negative P-T slope definitely established in the present study is in reasonable agreement with the value, -0.0023(8) GPa/C, that was calculated from the thermochemical data on the enthalpy of transition. The molar volume change accompanied with this transformation was estimated to be about 13 percent at about 6 GPa and 1000 C.
Akaogi Masaki
Akimoto S.
Shimomura Osamu
Susaki J.
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