Zirconia powders were prepared by heating at 470 °C hydrothermal precursors obtained by precipitation at increasing pH (from 2 to 12). The phase composition of the calcined products varied from pure monoclinic (at the acid extreme) to pure tetragonal (neutral-alkaline range). For the mixed phase samples, the relative enrichment in the two polymorphs was estimated by interpretation of X-ray diffractograms. Electrochemical determinations of the double layer reactivity of the pure and mixed phase oxides were performed and combined with characterizations of the surface state by X-ray photoelectron spectroscopy (XPS). Interpretations of the distinctive electrochemical features shown by the different polymorphs are proposed.

Electrochemical features of zirconia polymorphs. The interplay between structure and surface OH species / S. Ardizzone, C.L. Bianchi. - In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY. - ISSN 1572-6657. - 465:2(1999 Apr), pp. 136-141.

Electrochemical features of zirconia polymorphs. The interplay between structure and surface OH species

S. Ardizzone
Primo
;
C.L. Bianchi
Ultimo
1999

Abstract

Zirconia powders were prepared by heating at 470 °C hydrothermal precursors obtained by precipitation at increasing pH (from 2 to 12). The phase composition of the calcined products varied from pure monoclinic (at the acid extreme) to pure tetragonal (neutral-alkaline range). For the mixed phase samples, the relative enrichment in the two polymorphs was estimated by interpretation of X-ray diffractograms. Electrochemical determinations of the double layer reactivity of the pure and mixed phase oxides were performed and combined with characterizations of the surface state by X-ray photoelectron spectroscopy (XPS). Interpretations of the distinctive electrochemical features shown by the different polymorphs are proposed.
Calcination ; Heating ; pH effects; Phase composition ; Powders ; Precipitation (chemical) ; urface structure ; X ray diffraction analysis ; X ray photoelectron spectroscopy, Polymorphism, Zirconia
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/182158
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