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首页> 外文期刊>ISIJ international >Structural Analysis of Mixed Alkali Silicate Melts through ~(29)Si MAS-NMR and Impedance Measurements
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Structural Analysis of Mixed Alkali Silicate Melts through ~(29)Si MAS-NMR and Impedance Measurements

机译：〜（29）Si MAS-NMR和阻抗测量法分析混合碱式硅酸盐熔体的结构

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摘要

The mixed alkali effect of silicate melts was investigated by performing ~(29)Si magic-angle spinning-nuclear magnetic resonance (MAS-NMR) measurements and impedance spectroscopy analysis. The obtained ~(29)Si MAS-NMR results showed that the Qn species of quenched glass was monotonically dependent on the ratio of the alkali mixture. In contrast, the equivalent circuit components given by impedance measurements of silicate melts composed of mixed alkalis were found to have extreme values. The ~(29)Si MAS-NMR results suggested that these extreme values were unrelated to the structure of the silicate, but were related to the alkali present in the melt influencing the equivalent circuit components. This is thought to be caused by the increased pre-exponential factor, which is related to the concentration of ions with movement in the melt that is initiated by alkali mixing. It was also found that the equivalent circuit components of the super-cooled melt (i.e., the homogeneous melt just below the liquidus temperature) were significantly different from the equivalent circuit components of the homogeneous melt above the liquidus temperature. This is considered to be due to the fact that the activation energy of ion conduction in the super-cooled melt was increased by —18%.
机译：通过进行〜（29）Si幻角旋转核磁共振（MAS-NMR）测量和阻抗谱分析，研究了硅酸盐熔体的混合碱效应。所得的〜（29）Si MAS-NMR结果表明，淬火玻璃的Qn种类单调依赖于碱混合物的比例。相反，发现由混合碱组成的硅酸盐熔体的阻抗测量给出的等效电路元件具有极高的值。 〜（29）Si MAS-NMR结果表明，这些极值与硅酸盐的结构无关，但与熔体中存在的影响等效电路组件的碱有关。认为这是由于预指数因子增加所致，这与碱混合引发的离子浓度随熔体运动而变化有关。还发现过冷熔体的等效回路成分（即，刚好在液相线温度以下的均质熔体）与液相线温度以上均质熔体的等效回路成分显着不同。认为这是由于过冷熔体中离子传导的活化能增加了-18％。

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