EXPERIMENTAL DETERMINATION AND INTERPRETATION OF THE SOLUBILITY OF CORUNDUM IN H2O BETWEEN 350 AND 600°C FROM 0.5 TO 2.2 KBAR
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dc.contributor.author | Walther J.V. | |
dc.date.accessioned | 2020-12-17T04:15:19Z | |
dc.date.available | 2020-12-17T04:15:19Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=275056 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 23, 4955-4964 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20983 | |
dc.description.abstract | Corundum solubility was measured in H2O between 350° and 600°C from 0.5 to 2.2 kbar. The base-10 logarithm of molality of Al in equilibrium with corundum along the 0.5 kbar isobar decreases with increasing temperature from -3.44 at 400°C to -5.52 at 600°C, but at 2.0 kbar the logarithm of molality of Al increases from -3.25 at 400°C to -3.09 at 600°C. Electrostatic energetics appear important in stabilizing the dominate Al species as isotherms of solubility are a linear function of the reciprocal of the dielectric constant of H2O. These results together with values reported for corundum solubility in KOH solutions (Pascal and Anderson, 1989; Azaroual et al., 1996) are used to constrain the dominant Al species in pure H2O solutions to Al(OH)03. The base-10 logarithm of the molal equilibrium constants for the reaction: Al(OH)-4 + H+ = Al(OH)03 + H2O at 2.0 kbar and 400°, 500°, 600°, and 700°C are computed to be 6.33, 5.74, 6.39, and 6.75, respectively. It is argued that KAl(OH)04 is not an important species in KOH aqueous solutions as increasing Al(OH)-4 plus Al(OH)03 with increasing pH and ionic strength can account for the increased corundum solubility within experimental uncertainty. | |
dc.title | EXPERIMENTAL DETERMINATION AND INTERPRETATION OF THE SOLUBILITY OF CORUNDUM IN H2O BETWEEN 350 AND 600°C FROM 0.5 TO 2.2 KBAR | |
dc.type | Статья |
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