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

• 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; 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

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（1）由于矿渣的结晶而引起的光散射，（2）Fe^<3+>离子和（3）氧气供体能力的均值变化，（2）氧化物的配位数的变化是从（1）光的散射，（1）氧化物的均值变化。在FE_2O_3-CAO-SIO_2，FE_2O_3-CAO-SIO_2-AL_2O_3和Fe_2O_2O_3-NA_2O-SIO_2炉渣上进行吸收系数测量。发现吸收边缘随着Fe_2O_3含量的增加而略微移动到更高的波长，但随着碱度的增加，（％cao） /（％sio_2）和（％na_2o） /（％sio_2） /（％sio_2）和al_2o_3 content.2。 X射线衍射显示出没有样品的任何结晶相的痕迹。因此，已经得出结论，电荷传递带的吸收边缘移位不是由于炉渣的结晶引起的。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，从而导致吸收边缘向更高波长的转移。但是，结果表明，随着（四面体对称性中的fe^<2+>离子的比率/总fe^<3+>离子）降低，吸收边缘移至较高的波长。因此，已经认为，吸收边缘向更高的波长转移与Fe^<3+>离子的配位数变化无关。4。观察到吸收边缘会随着矿渣中氧气的离子折射率的增加而转移到更高的波长。因此，已经提出吸收边缘移位与氧离子的电子供体能力有关。