Effect of transition metal oxides addition on the color tone of Bi₄V₂O₁₁-based red pigments

Abstract

Bi₄V₂O₁₁ (BiVO) is an Aurivillius-type layered compound that exhibits a red color, and has been attracting attention for its non-toxicity. In this study, we have synthesized a variety of metal oxide-doped Bi₄V₂O₁₁, and aimed to evaluate the effect of the doped metal element on the color tone of the pigments. Bi₂O₃ and V₂O₅ were weighed to 2:1 in mole fraction and mixed in a dry-ball mill with zirconia media for 10 min. Next, transition metal oxides (MnO₂, α-Fe₂O₃, CoO, NiO, CuO, TiO₂, ZrO₂, and HfO₂) were added to the Bi₂O₃–V₂O₅ mixture, and they were mixed, and calcined at 800 °C in the air for 10 h. The obtained powders were pulverized to obtain sample pigments, BiVO and BiXVO (X = Mn, Fe, Co, Ni, Cu, Ti, Zr, and Hf). The BiVO pigment had a brownish-red color. The BiFeVO, BiNiVO, BiTiVO, BiZrVO, and BiHfVO pigments demonstrated orangish-red colors. The BiCuVO pigment displayed a dark and dull yellow, and the BiMnVO and BiCoVO pigments showed black achromatic colors, which were verified by UV–Vis spectroscopy.