Solubility Behavior and Phase Stability of Transition Metal Oxides in Alkaline Hydrothermal Environments

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Description

The solubility behavior of transition metal oxides in high temperature water is interpreted by recognizing three types of chemical reaction equilibria: metal oxide hydration/dehydration, metal oxide dissolution and metal ion hydroxocomplex formation. The equilibria are quantified using thermodynamic concepts and the thermochemical properties of the metal oxides/ions representative of the most common constituents of construction metal alloys, i.e., element shaving atomic numbers between Z = 22 (Ti) and Z = 30 (Zn), are summarized on the basis of metal oxide solubility studies conducted in the laboratory. Particular attention is devoted to the uncharged metal ion hydrocomplex, M{sup Z}(OH){sub Z}(aq), since ... continued below

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1151 Kilobytes pages

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Ziemniak, S.E. May 18, 2000.

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  • Lockheed Martin
    Publisher Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)
    Place of Publication: Schenectady, New York

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Description

The solubility behavior of transition metal oxides in high temperature water is interpreted by recognizing three types of chemical reaction equilibria: metal oxide hydration/dehydration, metal oxide dissolution and metal ion hydroxocomplex formation. The equilibria are quantified using thermodynamic concepts and the thermochemical properties of the metal oxides/ions representative of the most common constituents of construction metal alloys, i.e., element shaving atomic numbers between Z = 22 (Ti) and Z = 30 (Zn), are summarized on the basis of metal oxide solubility studies conducted in the laboratory. Particular attention is devoted to the uncharged metal ion hydrocomplex, M{sup Z}(OH){sub Z}(aq), since its thermochemical properties define minimum solubilities of the metal oxide at a given temperature. Experimentally-extracted values of standard partial molal entropy (S{sup 0}) for the transition metal ion neutral hydroxocomplex are shown to be influenced by ligand field stabilization energies and complex symmetry.

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1151 Kilobytes pages

Notes

OSTI as DE00821298

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  • Other Information: PBD: 18 May 2000

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  • Report No.: LM-00K035
  • Grant Number: AC 12-00-SN39357
  • DOI: 10.2172/821298 | External Link
  • Office of Scientific & Technical Information Report Number: 821298
  • Archival Resource Key: ark:/67531/metadc737389

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  • May 18, 2000

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 28, 2016, 9:43 p.m.

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Ziemniak, S.E. Solubility Behavior and Phase Stability of Transition Metal Oxides in Alkaline Hydrothermal Environments, report, May 18, 2000; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc737389/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.