Abstract
A black-TiZrO4 oxide film with light absorption in the visible and near-infrared regions was successfully formed on a surface using the atmospheric oxidation of a Ti–Zr alloy. The absorption of light in a wide range of wavelengths in the black-TiZrO4 oxide film was caused by a decrease in the energy gap owing to the oxygen deficiency, as indicated from the X-ray photoelectron spectroscopy analysis, and from a decrease in the refined lattice parameters, based on X-ray diffraction results. Moreover, no cracks or voids were observed within the TiZrO4 oxide film or at the interface between the oxide film and metallic Ti–Zr matrix, resulting in an ideal film. The rapid atmospheric oxidation in Ti–Zr alloy is attributed to both the promotion of the inward diffusion of oxygen ions by the substitution of Zr for Ti, and the faster diffusion of oxygen ions in a Ti–Zr-based oxide film.
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