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Thermodynamic properties of gallium hydroxide oxide (alpha -GaOOH) at temperatures to 700 K

Gleb S. Pokrovski, Igor I. Diakonov, Pascale Benezeth, Vyacheslav M. Gurevich, Konstantin S. Gavrichev, Vadim E. Gorbunov, Jean-Louis Dandurand, Jacques Schott and Igor L. Khodakovsky
Thermodynamic properties of gallium hydroxide oxide (alpha -GaOOH) at temperatures to 700 K
European Journal of Mineralogy (October 1997) 9 (5): 941-951

Abstract

The standard molal thermodynamic properties of alpha -GaOOH at T were retrieved from low-T heat capacity measurements, solubility measurements of alpha -GaOOH and beta -Ga (sub 2) O (sub 3) , and data available from the alpha -GaOOH-beta -Ga (sub 2) O (sub 3) transformation in the presence of aqueous solutions. The heat capacity of alpha -GaOOH as a function of T was found to be consistent with C degrees (sub p) = 54.38 + 0.06418 T-11.3 X 10 (super 5) /T (super 2) (J/mol/K) in the range 298-700 K. The estimated standard molal entropy is 51.61 + or - 0.26 J/mol.K, and the estimated standard Gibbs free energy of formation from the elements is -627.9 + or - 2.0 kJ/mol. These data allowed the prediction that alpha -GaOOH and beta -Ga (sub 2) O (sub 3) are the stable phases in the Ga-O-H system at saturated water vapour P below and above 573 K, respectively.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 5
Title: Thermodynamic properties of gallium hydroxide oxide (alpha -GaOOH) at temperatures to 700 K
Affiliation: UPS/CNRS/OMP, Laboratoire de Geochimie, Toulouse, France
Pages: 941-951
Published: 199710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 30
Accession Number: 1997-077043
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 6 tables
Secondary Affiliation: Institute of General and Inorganic Chemistry, RUS, Russian FederationVernadsky Institute of Geochemistry and Analytical Chemistry, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199724
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