The paper reports data concerning zirconia samples obtained by coupling a first hydrolysis reaction of ZrCl4 in solution at 100°C with subsequent treatments of the powders at higher temperatures (400-800°C). The products of the reactions are characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption. The samples appear to be composed, at any temperature, of pure baddelyite with a degree of crystallinity which increases with the temperature of preparation. Morphologically, the products have the shape of prismatic rods of variable dimensions. The rods are the result of sintering of the primary particles produced during the precipitation in solution. The general prismatic pattern of the rods is not affected by the temperature of calcination; conversely, the texture of the rods (i.e. the degree of hydration and aggregation of the primary particles) strongly depends on the temperature of the treatment. The nature of the interactions taking place between water and the solid particles, at different temperatures, is discussed. © 1993.

Temperature effects on rod-like zirconia particles. Morphology, degree of crystallinity and texture / S. Ardizzone, P. Lazzari, E. Sivieri. - In: MATERIALS LETTERS. - ISSN 0167-577X. - 16:1(1993), pp. 45-50.

Temperature effects on rod-like zirconia particles. Morphology, degree of crystallinity and texture

S. Ardizzone;
1993

Abstract

The paper reports data concerning zirconia samples obtained by coupling a first hydrolysis reaction of ZrCl4 in solution at 100°C with subsequent treatments of the powders at higher temperatures (400-800°C). The products of the reactions are characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption. The samples appear to be composed, at any temperature, of pure baddelyite with a degree of crystallinity which increases with the temperature of preparation. Morphologically, the products have the shape of prismatic rods of variable dimensions. The rods are the result of sintering of the primary particles produced during the precipitation in solution. The general prismatic pattern of the rods is not affected by the temperature of calcination; conversely, the texture of the rods (i.e. the degree of hydration and aggregation of the primary particles) strongly depends on the temperature of the treatment. The nature of the interactions taking place between water and the solid particles, at different temperatures, is discussed. © 1993.
Crystal structure ; Hydrolysi ; Morphology; Scanning electron microscopy ; Textures ; Thermal effects ; X ray analysis, Crystallinity ; Rod like zirconia particles ; X ray diffraction, Zirconia
Settore CHIM/02 - Chimica Fisica
MATERIALS LETTERS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/187665
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