Color and Vanadium Valency in V-Doped ZrO2 |
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| Authors: | Feng Ren Shingo Ishida Nobuyuki Takeuchi |
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| Affiliation: | Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606, Japan |
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| Abstract: | The distribution and chemical states of vanadium in V-doped ZrO2 were studied to clarify the origin of the color of vanadium-zirconium yellow pigment in comparison with vanadium-tin yellow pigment. ESCA data and measurements of lattice constants of V-doped ZrO2 revealed that vanadium was dissolved mainly as V4+ substituting for Zr in ZrO2 lattice, and its solubility limit was 0.5 wt% as V2O5. It was found that the yellow color of vanadium-zirconium yellow was produced predominantly by the dissolved vanadium and that the contribution of vanadium oxide on ZrO2 grains to the yellow color was about 1/30 of that of the dissolved vanadium when compared on the basis of equimolar quantity of vanadium. Most of the undissolved vanadium oxide was in an amorphous or a poorly crystallized state. |
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