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% at about 6 GPa and 1000°C.
No takes yet. Share an insight, caveat, or question.
Susaki et al. (1985) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: