Characterization of the anodic growth and dissolution of antimony oxide films

摘要: Abstract The anodic growth, morphology and stability of antimony oxide films grown in buffered phosphate electrolytes has been characterized by electrochemical methods, situ ellipsometry atomic force microscopy. voltammetric behaviour for the growth at low potentials can be interpreted as stepwise electroformation different species with formation soluble up to give Sb 2 O 3 . This is followed film higher through an ionic conduction mechanism caused a ‘high field’, which drives migration typical “valve” metals. Ellipsometric results indicate that dissolve electrolysis media. Anodic are anisotropic, complex refractive indices lower than those crystalline oxides. ascribed hydration, anions incorporation or lack structure electric field strength obtained from thickness/potential dependence, 2.25 × 10 6  V cm −1 , also supports takes place current driven high within film. Morphology AFM shows surfaces smooth flat pore-free. grain texture depends on concentration electrolyte consequence chemical dissolution rate. passive open circuit was analyzed cyclic voltammetry either constant increasing switching potentials. overall described terms high-field model coupled homogeneous process. parameters A β equation i  =  A  exp ( βe ) characterize dependence between well conditions obtained. Dissolution properties, promoted ions almost independent pH.