Calorimetric study of high-pressure phase transitions among the CdGeO3 polymorphs (pyroxenoid, garnet, ilmenite, and perovskite structures)

@article{Akaogi1987CalorimetricSO,
  title={Calorimetric study of high-pressure phase transitions among the CdGeO3 polymorphs (pyroxenoid, garnet, ilmenite, and perovskite structures)},
  author={Masaki Akaogi and Alexandra Navrotsky},
  journal={Physics and Chemistry of Minerals},
  year={1987},
  volume={14},
  pages={435-440}
}
At high pressures, CdGeO3 pyroxenoid transforms to garnet, then to ilmenite, and finally to perovskite. Enthalpies of transition among the four phases were measured by high temperature calorimetry. The entropies of transition and slopes of the boundaries were calculated using the measured enthalpies and free energies calculated from the phase equilibrium data. Pyroxenoid and garnet are very similar energetically. However garnet is a high pressure phase because of its lower entropy and smaller… CONTINUE READING