Thermodynamic stability of CoOOH and its coprecipitation with manganese

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doi: 10.1016/0016-7037(85)90173-5
Authors:Hem, John D.; Roberson, Charles E.; Lind, Carol J.
Author Affiliations:Primary:
U. S. Geol. Surv., Menlo Park, CA, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 49(3), p.801-810. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1985
Note:In English. 20 refs.; illus. incl. 7 tables
Summary:A precipitate of cobalt oxyhydroxides formed by bubbling oxygen through a dilute solution of Co(NO3)2 held at pH 9.0 and 25°C was aged for 23 months in contact with the original solution, with access to atmospheric oxygen. Co3O4 and CoOOH were identified in the precipitate by XRD. Chemical equilibria involving these solids were evaluated by measurements of solution pH and Co2+ activities, and by redox potential measurements, and gave a 060DELTA G0CoOOH of -92.3 + or - 0.5 kcal/mole. This value and other thermodynamic data show the relative feasibility of hypothetical reaction steps and changes in reaction paths during automated coprecipitation titrations and subsequent aging of a precipitate that finally contained beta -MnOOH,MnO2 (birnessite) and CoOOH. (Authors' abstract) [C.M.B.H.]
Subjects:Cobalt; Coexisting minerals; Experimental studies; Free energy; Geochemistry; Hydroxides; Manganese; Metals; Oxides; Phase equilibria; Precipitation; Properties; Stability; Synthesis; Thermodynamic properties; Reactions
Abstract Numbers:86M/0514
Record ID:1985049626
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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