2023 Fiscal Year Final Research Report
Low temperature synthesis of Bi-based complex oxide pigment with elemental additions and improvement of chromic characteristics
| Project/Area Number |
20K05142
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Kitakyushu National College of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小畑 賢次 北九州工業高等専門学校, 生産デザイン工学科, 准教授 (70370046)
大川原 徹 北九州工業高等専門学校, 生産デザイン工学科, 准教授 (50632650)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | Bi系複合酸化物 / パイロクロア型構造 / 環境調和型セラミックス / 黄色系無機顔料 / 第一原理バンド計算 / 固体電子構造 |
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| Outline of Final Research Achievements |
In this study, we aimed to develop yellow pigments with excellent visibility using Bi2M2O7 (M = Ti, Zr, Ce) with pyrochlore-type structure. Low-temperature synthesis of Bi2M2O7 (BMO) by a complex polymerization method yielded high-purity samples for Bi2Ce2O7 (BCO). The addition of V to BCO improved the coloring performance, and the addition of Ca or La as the second component increased the absorbance. The value of b*, an index of yellowness, was evaluated using the L*a*b* color system. As a result, the b* value was highest when V and Ca or La were co-doped in BCO. First-principles band calculations for the structure-optimized Bi2Ti2O7 showed that the V 3d energy levels are formed in the band gap when V is added, and that the charge-transfer absorption between V and O is enhanced by the co-doping of Ca.
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| Free Research Field |
無機材料化学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の特色は、材料科学，無機材料工学，有機合成化学を融合して、環境調和型の新規な黄色系微粒子顔料を創製することである。本研究の知見は、これらの分野の機能性材料開発で重要である他、光触媒，環境材料，エネルギー材料，建築材料等の分野の発展にも貢献できる。
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