Effect of Coordination Structure of Iron Ions on Absorption of Light in Slags Containing Iron Oxides

铁离子配位结构对含氧化铁渣光吸收的影响

基本信息

批准号：
07650868
负责人：
SUSA Masahiro
金额：
$ 1.6万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650868/
关键词：
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

项目摘要

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.

从以下角度研究了含铁氧化物炉渣中电荷转移带的吸收边位移：(1)炉渣结晶导致的光散射，(2)Fe^<3+>配位数的变化离子和（3）氧离子的电子供体功率。在0.3-3mum波长范围内测量了Fe_2O_3-CaO-SiO_2、Fe_2O_3-CaO-SiO_2-Al_2O_3和Fe_2O_3-Na_2O-SiO_2渣的吸收系数。 1．研究发现，随着Fe_2O_3含量的增加，吸收边稍微向更高波长移动，但随着碱度即(%CaO)/(%SiO_2)和(%Na_2O)/(%SiO_2)比率和Al_2O_3含量的增加，吸收边显着向更高波长移动。 2. X 射线衍射显示任何样品都没有结晶相的痕迹。因此，可以得出结论，电荷转移带的吸收边移动不是由于炉渣的结晶造成的。3．如果Fe^3+离子占据四面体配位位点而不是八面体配位位点，则铁和氧电子之间的相互作用将变小，导致吸收边向更高波长移动。然而，结果表明，随着(四面体对称的Fe ^ 2+ 离子/总Fe ^ 3+ 离子)比率的减小，吸收边向更高波长移动。因此，已经认为吸收边向更高波长的移动与Fe ^ 3+ 离子的配位数的变化无关。4。观察到随着炉渣中氧的离子折射率的增加，吸收边向更高的波长移动。因此，有人提出吸收边位移与氧离子的电子供体功率有关。