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Thermal decomposition of transition-metal hydroxides.

Hazell, Ian Frank. (1964) Thermal decomposition of transition-metal hydroxides. Doctoral thesis, University of Surrey (United Kingdom)..

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Previous studies of the process of corrosion of steel by superheated alkaline water have shown that the formation and subsequent decomposition of ferrous hydroxide may be responsible for some of the magnetite scale found in operating boilers. With the increasing use of alloy steels, the properties of cobalt and nickel hydroxides under these conditions are also of interest. There is reason to expect that the mechanism of the decomposition will be the same under hydrothermal conditions as for the dry solid and accordingly, kinetic studies of the decompositions have been made in air and in vacuo where appropriate. Both isothermal and non-isothermal methods have been used to obtain kinetic parameters. Previous methods for analysing non-isothermal data have been found to be unreliable and a new approach has been devised which gives results in agreement with isothermal studies. The similarity of the reaction under hydrothermal conditions has been confirmed by autoclave experiments. Ferrous, cobaltous and nickelic hydroxides all have the magnesium hydroxide structure and so similarities in the mode of decomposition are to be expected. For example, decompositions should be topotactio processes with a definite ciystallographic orientation between starting material and product. This has been confirmed by X-ray studies for the nickel hydroxide-nickel oxide system. The intensities of X-ray reflexions from nickel hydroxide have been investigated as considerable discrepancies exist between the results of earlier wrorkers. A good agreement between our experimental results and calculated values has been obtained. The factors influencing the course of the reaction under various conditions are discussed and possible mechanisms examined.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Hazell, Ian Frank.
Date : 1964
Contributors :
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1964.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 14:27
Last Modified : 06 Nov 2018 16:53

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