| Project/Area Number |
07650868
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
SUSA Masahiro Tokyo Institute of Technology・Department of Metallurgical Engineering, Associate Professor, 工学部, 助教授 (90187691)
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| Co-Investigator(Kenkyū-buntansha) |
NANKO Makoto Tokyo Institute of Technology・Department of Metallurgical Engineering, Research, 工学部, 助手 (90272666)
FUKUYAMA Hiroyuki Tokyo Institute of Technology・Department of Metallurgical Engineering, Research, 工学部, 助手 (40252259)
MARUYAMA Toshio Tokyo Institute of Technology・Department of Metallurgical Engineering, Professor, 工学部, 教授 (20114895)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Slags / Iron oxides / Absorption of light / Charge transfer band / Ligand / Basicity / Ion refractivity of oxygen / Mossbauer spectroscopy / 吸収端シフト / 結晶化 / 配位数 |
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| Research Abstract |
The absorption edge shift for the charge transfer band in slags containing iron oxides has been investigated from the viewpoints of (1) the scattering of light due to crystallisation of slags, (2) the change of the coordination number for Fe^<3+> ions and (3) the electron donor power of oxygen ions. Absorption coefficient measurements were made on Fe_2O_3-CaO-SiO_2, Fe_2O_3-CaO-SiO_2-Al_2O_3 and Fe_2O_3-Na_2O-SiO_2 slags in the 0.3-3mum wavelength range.
1. The absorption edge was found to move slightly to higher wavelengths with increasing Fe_2O_3 content, but shifted markedly to higher wavelengths with increasing basicity i.e. (%CaO) / (%SiO_2) and (%Na_2O) / (%SiO_2) ratios and Al_2O_3 content.
2. X-ray diffraction revealed no traces of crystalline phases forany of the samples. Thus, it has been concluded that the absorption edge shift for the charge transfer band is not due to crystallisation of slags.
3. If Fe^<3+> ions occupy tetrahedral coordination sites rather than octahedral coordination sites, interaction between the iron and oxygen electrons will become smaller, resulting in a shift of the absorption edge to higher wavelengths. However, the results have shown that the absorption edge shifts to higher wavelengths as the ratio of (Fe^<2+> ions in tetrahedral symmetry/the total Fe^<3+> ions) decreases. Thus, it has been considered that the absorption edge shift to higher wavelengths is not associated with the change of the coordination number for Fe^<3+> ions.
4. The absorption edge was observed to shift to higher wavelengths with increasing the ion refractivity of oxygen in the slags. Consequently, it has been proposed that the absorption edge shift is relevant to the electron donor power of oxygen ions.
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