SCANNING CALORIMETRIC DETERMINATIONS OF THE HEAT CONTENTS OF DIOPSIDE-RICH SYSTEMS DURING MELTING AND CRYSTALLIZATION
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dc.contributor.author | DeYoreo J.J. | |
dc.contributor.author | Lange R.A. | |
dc.contributor.author | Navrotsky A. | |
dc.date.accessioned | 2020-11-26T05:28:28Z | |
dc.date.available | 2020-11-26T05:28:28Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=661658 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1995, , 13, 2701-2707 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19611 | |
dc.description.abstract | The results of scanning calorimetric measurements on crystalline albite, diopside, diopside-anorthite, and diopside-wollastonite-enstatite are reported in the temperature range of 1300 K to 1775 K. The results for albite agree with those obtained previously using a drop-calorimetric technique and confirm that melting takes place during a 300 K temperature interval starting near the accepted equilibrium melting point of 1373 K. The heat content, H(T), of anorthite-diopside mixtures is calculated numerically based on existing thermodynamic data. The results are compared to measurements on a mechanical mixture of 10 mol% anorthite-90 mol% diopside containing 3% of second phase impurities. Due to the presence of these impurities, the onset of premelting or melting occurs at 150 K below the An-Di eutectic and the heat of fusion at the liquidus (1665 K) is 114 +/- 6 kJ/mol, which is 6% less than calculated for the pure mixture. Measurements of H(T) on a sample of 13 mol% wollastonite-83 mol% diopside are also presented. The measured heat of fusion at 1665 K is 125 +/- 7 kJ/mol, in excellent agreement with the value of 124.8 kJ/mol calculate from existing thermodynamic data. Our data place an upper limit of 7 kJ/mol on the heat of mixing in this system at 1665 K. | |
dc.title | SCANNING CALORIMETRIC DETERMINATIONS OF THE HEAT CONTENTS OF DIOPSIDE-RICH SYSTEMS DURING MELTING AND CRYSTALLIZATION | |
dc.type | Статья |
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