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Thermodynamic properties of the forsterite-fayalite (Mg2SiO4-Fe2SiO4) solid solution. determination of heat of formation |
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| Authors: | P Thierry C Chatillon-Colinet J C Mathieu J R Regnard J Amossé |
| Institution: | 1. Laboratoire de Thermodynamique et de Physicochimie Métallurgique, LA CNRS n° 29, ENS d'Electrochimie de Greneble, BP 44, F-38401, StMartin d'Hères, France 3. Centre d'Etudes Nucléaires de Grenoble DRF/Groupe d'Interactions Hyperfines, 17. Avenue des Martyrs, F-38041, Grenoble, France 4. Institut Dolomieu, rue Maurice Gignoux, F-38031, Grenoble, France |
| Abstract: | A high temperature calorimetric solution method involving the use of a sodium and lithium metaborate (NaBO2+LiBO2) molten bath at 1,180 K, has been developed in order to measure the enthalpy of formation of the forsterite-fayalite (Mg2SiO4-Fe2SiO4) system. The samples used for these measurements have been obtained by synthesis. They have been carefully controlled by chemical and X-ray analysis and Mössbauer spectroscopy. The results obtained for forsterite and fayalite agree closely with the data commonly found in the literature. Owing to the uncertainty of the experimental results, it is not possible to determine conclusively whether an enthalpy of mixing exists in this system. |
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