Comparative dissolution rates of defective nickel oxides from different sources

Pease, Wayne and Segall, Robert L. and Smart, Roger St. C. and Turner, Peter S. (1986) Comparative dissolution rates of defective nickel oxides from different sources. Journal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases, 82 (3). pp. 759-766. ISSN 0300-9599

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Abstract

Dissolution rates in acidic solution of nickel oxide prepared in air from carbonate and hydroxide salts at 550, 700, 1100 and 1450 °C are compared. The powders were pre-characterised by thermal analysis, B.E.T. surface area measurement, transmission electron microscopy, X-ray and electron diffraction and infrared spectroscopy. The carbonate decomposition process is considerably more energetic than that of the hydroxide. The rates per unit surface area for the ex-carbonate oxide are more than five times higher than those for the ex-hydroxide oxide at 550, 700 and 1100 °C annealing temperatures, but comparable at 1450 °C. The 700 °C ex-carbonate oxide shows anomalously high, initial rates, at <10 monolayer-equivalents removed, attributed to surface reduction. All samples show increases in rate with extent of dissolution owing primarily to surface roughening and increased kink site densities. The results are discussed in relation to excess (over equilibrium) surface and bulk defect concentrations introduced by decomposition proces, and modified by subsequent annealing.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Awaiting paper from Publisher or author.
Depositing User: Mr Wayne Pease
Faculty / Department / School: Historic - Faculty of Business - Department of Information Systems
Date Deposited: 11 Feb 2008 04:06
Last Modified: 28 Oct 2013 06:54
Uncontrolled Keywords: dissolution studies; thermal kinetics; defect concentrations; surface area studies
Fields of Research (FOR2008): 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030602 Chemical Thermodynamics and Energetics
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030603 Colloid and Surface Chemistry
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030601 Catalysis and Mechanisms of Reactions
Socio-Economic Objective (SEO2008): B Economic Development > 84 Mineral Resources (excl. Energy Resources) > 8403 First Stage Treatment of Ores and Minerals > 840305 Concentrating Processes of Base Metal Ores (excl. Aluminium and Iron Ores)
Identification Number or DOI: doi: 10.1039/F19868200759
URI: http://eprints.usq.edu.au/id/eprint/3524

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