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Thermodynamic properties of uranyl minerals / Tatiana Y. Shvareva in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 607-613 Titre : Thermodynamic properties of uranyl minerals : Constraints from calorimetry and solubility measurements Type de document : texte imprimé Auteurs : Tatiana Y. Shvareva, Auteur ; Jeremy B. Fein, Auteur ; Alexandria Navrotsky, Auteur Année de publication : 2012 Article en page(s) : pp. 607-613 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubility  Calorimetry  Thermodynamic  properties Résumé : More than 50 uranyl minerals, phases containing U6+ as the uranyl UO22+ cation, and hydroxide, carbonate, phosphate, and silicate anions, H2O, and alkali and alkaline earth cations, occur in nature and as corrosion products of spent nuclear fuel. Despite their importance and the need to understand their thermodynamics to predict uranium solubility, fate, and transport in the environment, reliable thermodynamic data have only been available recently. This paper summarizes recent studies of enthalpies of formation using high temperature oxide melt solution calorimetry and Gibbs free energies from solubility experiments. Standud state thermochemical parameters (at 25 °C and I bar) are tabulated and the stability and transformation sequences of these phases are discussed. The enthalpies of formation from oxides are discussed in terms of crystal structure and Lewis acid-base interactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476390 [article] Thermodynamic properties of uranyl minerals : Constraints from calorimetry and solubility measurements [texte imprimé] / Tatiana Y. Shvareva, Auteur ; Jeremy B. Fein, Auteur ; Alexandria Navrotsky, Auteur . - 2012 . - pp. 607-613. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 607-613 Mots-clés : Solubility  Calorimetry  Thermodynamic  properties Résumé : More than 50 uranyl minerals, phases containing U6+ as the uranyl UO22+ cation, and hydroxide, carbonate, phosphate, and silicate anions, H2O, and alkali and alkaline earth cations, occur in nature and as corrosion products of spent nuclear fuel. Despite their importance and the need to understand their thermodynamics to predict uranium solubility, fate, and transport in the environment, reliable thermodynamic data have only been available recently. This paper summarizes recent studies of enthalpies of formation using high temperature oxide melt solution calorimetry and Gibbs free energies from solubility experiments. Standud state thermochemical parameters (at 25 °C and I bar) are tabulated and the stability and transformation sequences of these phases are discussed. The enthalpies of formation from oxides are discussed in terms of crystal structure and Lewis acid-base interactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476390