Low-temperature heat capacities, entropies and enthalpies of Mg2SiO4 polymorphs, and α−β−γ and post-spinel phase relations at high pressure

@article{Akaogi2007LowtemperatureHC,
  title={Low-temperature heat capacities, entropies and enthalpies of Mg2SiO4 polymorphs, and α−β−γ and post-spinel phase relations at high pressure},
  author={Masaki Akaogi and H. Takayama and Hiroshi Kojitani and Hitoshi Kawaji and Tooru Atake},
  journal={Physics and Chemistry of Minerals},
  year={2007},
  volume={34},
  pages={169-183}
}
The low-temperature isobaric heat capacities (Cp) of β- and γ-Mg2SiO4 were measured at the range of 1.8–304.7 K with a thermal relaxation method using the Physical Property Measurement System. The obtained standard entropies (S°298) of β- and γ-Mg2SiO4 are 86.4 ± 0.4 and 82.7 ± 0.5 J/mol K, respectively. Enthalpies of transitions among α-, β- and γ-Mg2SiO4 were measured by high-temperature drop-solution calorimetry with gas-bubbling technique. The enthalpies of the α−β and β−γ transitions at… CONTINUE READING

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