THERMODYNAMIC PROPERTIES OF GALLIUM HYDROXIDE OXIDE (α-GAOOH) AT TEMPERATURES TO 700 K
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dc.contributor.author | Pokrovski G.S. | |
dc.contributor.author | Diakonov I.I. | |
dc.contributor.author | Bénézeth P. | |
dc.contributor.author | Dandurand J.L. | |
dc.contributor.author | Schott J. | |
dc.contributor.author | Gurevich V.M. | |
dc.contributor.author | Gavrichev K.S. | |
dc.contributor.author | Gorbunov V.E. | |
dc.contributor.author | Khodakovsky I.L. | |
dc.date.accessioned | 2020-12-24T03:38:04Z | |
dc.date.available | 2020-12-24T03:38:04Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=13274617 | |
dc.identifier.citation | European Journal of Mineralogy, 1997, , 5, 941-951 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21210 | |
dc.description.abstract | The standard molal thermodynamic properties of α-GaOOH at temperatures to 700 K were retrieved from (1) low-temperature α-GaOOH heat capacity measurements, (2) solubility measurements of α-GaOOH and β-Ga2O3, and (3) data available for the α-GaOOH - β-Ga2O3 transformation in the presence of aqueous solution. The heat capacity of α-GaOOH as a function of temperature was found to be consistent with the formulation Cp° = 54.38 + 0.06418 T - 11.3 105/T2 (J/mol.K) in the temperature range 298-700 K. The estimated standard molal entropy of α-GaOOH from low-temperature heat capacity measurements is 51.61 ± 0.26 J/mol.K. The estimated standard molal Gibbs free energy of formation from the elements for α-GaOOH as retrieved from α-GaOOH and β-Ga2O3 solubility experiments and available stability data was -627.9 ± 2.0 kJ/mol. The corresponding α-GaOOH standard molal enthalpy of formation from the elements was found to be -705.3 ± 2.5 kJ/mol. These data allowed the prediction of the thermodynamic properties of α-GaOOH to high temperatures and demonstrate that α-GaOOH and β-Ga2O3 are the stable solid phases in the Ga-O-H system at saturated water vapour pressure below and above 573 K, respectively. | |
dc.title | THERMODYNAMIC PROPERTIES OF GALLIUM HYDROXIDE OXIDE (α-GAOOH) AT TEMPERATURES TO 700 K | |
dc.type | Статья |
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