Characterization of the anodic growth and dissolution of antimony oxide films

OMAR E. LINAREZ PÉREZ, MANUEL A. PÉREZ AND MANUEL LÓPEZ TEIJELO.

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Año: 2009 p. 64 - 64

he anodic growth, morphology and stability of antimony oxide films grown in buffered phosphate electrolytes has been characterized by electrochemical methods, in-situ ellipsometry and atomic force microscopy. The anodic volammetric behaviour for the growth aof antimony oxide films at low potentials can be interpreted as the stepwise electroformation of didderent antimony species with formation of soluble species up to give Sb2O3. This is followed by the anodic film growth at higher potentials through an ionic conduction mechanism caused by a "high field", which drives the ionic migration as in typical "valve" metals. Ellipsometric results indicate that anodic films dissolve in the electrolysis media. Anodic Sb2O3 films are anisotropic, whit complex refractive indices lower than those of crystalline antimony oxides. This is ascribed to hydration, anions incorporation or lack of crystalline structure in anodic oxides. The electric field strength obtained from thickness/potential depende