表題番号：2015K-168
日付：2016/03/31
研究課題無機フォトクロミック物質における添加元素の局所環境解析
| 研究者所属（当時） | 資格 | 氏名 | |
|---|---|---|---|
| （代表者） | 理工学術院 基幹理工学部 | 教授 | 山本 知之 |
- 研究成果概要
- Recently efficient inorganic photochromic oxide materials were found, in which it was mentioned that 3d transition metal and/or rare earth dopings enhance photochromic property. However, these mechanisms have not yet been clearly understood. In the current study, local environment analysis of doped ions in inorganic photochromic oxide materials has been investigated. Samples were synthesized by a conventional solid-state reaction method in air and reducing atmosphere (Ar:97%+H2:3%). Crystal structures of the synthesized samples were examined by the powder X-ray diffraction technique and the color-change due to the irradiation of UV-ray and visible light was examined by diffuse reflectance spectrum using a UV-Vis spectrometer. Local environment analysis was carried out by measuring the X-ray absorption near-edge structure (XANES) at K-edge of 3d transition metal and L-edge of rare earth element. To analyze the fine structure of the observed XANES spectra, we also performed the all-electron first-principles calculations within a density functional theory. This method has been applied to several types of the materials. Among them, we could find out the necessary condition to show strong photochromism in Fe doped BaMgSiO4, that is Fe must substitute at Mg2+ site as divalent ions.