Abstract
Isobaric heat capacities (CP) of Mg2SiO4 forsterite and ringwoodite were measured by differential scanning calorimetry in the temperature range of 306-833 K. The measured CP of Mg2SiO4 forsterite was consistent with those reported by previous studies. On the other hand, the present CP of Mg2SiO4 ringwoodite was about 3-5% larger than those measured by previous researchers. The calorimetric data of Mg2SiO4 ringwoodite were extrapolated to 2500 K using a lattice vibrational model calculation, which well reproduced the low-temperature CP data measured by thermal relaxation method. The calculated CP shows good agreement with the present calorimetric data. The obtained CP was expressed by the polynomial of temperature: CP = 164.30 + 1.0216 × 10−2T + 7.6665 × 103T−1 - 1.1595 × 107T−2 + 1.3807 × 109T−3 [J/(mol·K)] in the range of 250-2500 K.
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