Abstract
A new solid solution based on general formula Ba4In2-xMnxO7+y (0 ≤ x ≤ 0.2) has been successfully synthesized by the sol-gel method. The compounds exhibited grass green to olive colors. The origin of the color apparently due to the presence of Mn4+ as a chromophore in square pyramidal coordination. The X-ray diffraction results showed that the space group of all samples is I4/mmm. The oxidation state of Mn ion is confirmed to be +4 from the results of magnetization measurements and X-ray photoelectronic spectra (XPS). The color of Ba4In2O7 is white. With a small amount of Mn substitution, the color of Ba4In2-xMnxO7+y solid solution changes to grass green, and it turned to olive green when x = 0.2. The UV–Vis absorbance spectra revealed that the absorption peaks are fitted with d3 (Mn4+) configuration in the square pyramid, and the mechanism of color is explained.
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