The precipitation of goethite particles by a hydrothermal procedure is described. The reaction involves the oxidation of ferrous ion solutions with hydroxylamine salts at 85 °C. The phase purity of the oxide is discussed as a function of the solution composition, and in particular of the pH and of the different anions. Scanning electron microscope examinations show that goethite particles are acicular crystals with a rather narrow size distribution. The crystals show prismatic shape and appear to be elongated in the [001] crystallographic direction. The attribution of 110 form to the side faces of the prisms is proposed. © 1985.

Hydrothermal preparation of goethite crystals / S. Ardizzone, L. Formaro. - In: SURFACE TECHNOLOGY. - ISSN 0376-4583. - 26:3(1985), pp. 269-274.

Hydrothermal preparation of goethite crystals

S. Ardizzone
Primo
;
L. Formaro
Ultimo
1985

Abstract

The precipitation of goethite particles by a hydrothermal procedure is described. The reaction involves the oxidation of ferrous ion solutions with hydroxylamine salts at 85 °C. The phase purity of the oxide is discussed as a function of the solution composition, and in particular of the pH and of the different anions. Scanning electron microscope examinations show that goethite particles are acicular crystals with a rather narrow size distribution. The crystals show prismatic shape and appear to be elongated in the [001] crystallographic direction. The attribution of 110 form to the side faces of the prisms is proposed. © 1985.
CRYSTALS - Structure, CRYSTALLOGRAPHIC FACES; CRYSTALLOGRAPHIC ORDERING; GOETHITE; HYDROTHERMAL PREPARATION; SCANNING ELECTRON MICROSCOPE, IRON COMPOUNDS
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/186745
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