10:15 AM - 10:30 AM
[R3-04] Redetermination of enthalpy of Mg2SiO4 wadsleyite
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.