2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
[R3-04]Redetermination of enthalpy of Mg2SiO4 wadsleyite
*Hiroshi Kojitani1, Toru Inoue2, Masamichi Noda2, Masaki Akaogi3(1. Gakushuin Univ., Sci., 2. Hiroshima Univ., Advanced Sci. and Eng., 3. Univ. Tokyo, Sci.)
Keywords:
wadsleyite,enthalpy,drop-solution calorimetry,thermodynamics,high-pressure synthesis
Scince the previous enthalpy value of Mg2SiO4 wadsleyite had relatively large uncertainty, drop-solution enthalpy of Mg2SiO4 wadsleyite was re-measured using lead borate solvent and the Calvet-type calorimter whose temperature was kept at 978 K. Drop-solution enthalpy of Mg2SiO4 wadsleyite was determined to be 141.38±1.13 kJ/mol. It is expected that thermodynamic calculation using the present enthalpy data gives a narrower stability field of Mg2SiO4 wadsleyite than that calculated by adpting the previous enthalpy data.