Synthesis and optical properties of turquoise- and green-colored brownmillerite- type Ba2In2-x-yMnxAlyO5+x codoped with manganese and aluminum |
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| Authors: | Peng Jiang Wen-hui Yang Yun-cheng Zhou Jian-lei Kuang Yong Li Ting Xiao |
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| Affiliation: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Brownmillerite-type oxides Ba2In2?x?yMnxAlyO5+x (0≤x≤ 0.6, 0≤y≤ 0.5) were prepared at 1300°C through solid-state reaction. X-ray diffraction (XRD) analysis showed that the structure symmetry evolved from orthorhombic to cubic with increasing Mn and Al con-tents. Wheny was greater than 0.3, peaks associated with small amounts of BaAl2O4 and Ba2InAlO5 impurities were observed in the XRD patterns. When substituted with a small amount of Mn (x≤ 0.3), the Ba2In2?x?yMnxAlyO5+x samples exhibited an intense turquoise color. The color changed to green and dark-green with increasing Mn concentration. UV–vis absorbance spectra revealed that the color changed only slightly upon Al doping. The valence state of Mn ions in Ba2In2?x?yMnxAlyO5+x was confirmed to be +5 on the basis of X-ray photoelectron spectroscopic analysis. According to this analysis, the intense turquoise color of the Ba2In2?x?yMnxAlyO5+x samples is rooted in the existence of Mn5+; thus, the introduction of Al does not affect the optical properties of the compounds. |
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| Keywords: | oxides doping pigments optical properties solid state reaction |
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