INFLUENCE OF NEGATIVE CHARGE DISTRIBUTION AND LOCATIONS OF Na<sup>+</sup> IONS ON IONIC CONDUCTIVITY OF Na-MICAS
INFLUENCE OF NEGATIVE CHARGE DISTRIBUTION AND LOCATIONS OF Na<sup>+</sup> IONS ON IONIC CONDUCTIVITY OF Na-MICAS
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Na<sup></sup>离子负电荷分布和位置对Na-云母离子电导率的影响
DOI：
10.11362/jcssjclayscience.23.3_31
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Seiichi Taruta
中科院分区：
文献类型：
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作者：
Junnosuke Kemi;Tomohiro Yamaguchi;Tomohiko Okada;Seiichi Taruta
研究了钠云母中负电荷分布和Na+离子位置对离子电导率的影响。用X射线衍射仪、傅里叶变换红外分光光度计、23 Na魔角旋转核磁共振仪和X射线光电子能谱仪详细测定了Na+离子在制备态和700 ℃加热态钠云母中的位置。结果表明，在钠云母中发现了四种Na+离子，即八面体片空位中的Na+离子、层间的水合Na+离子、被六个基氧包围的脱水Na+离子和被吸引到双三角孔内部的Na+离子。通过交流四探针法在400至600 ℃下测量加热的钠云母的离子电导率。在钠云母中，钠带沸石显示出最大的离子电导率，在600 ℃时为6.61× 10− 4 S/cm。从结果中得到以下关系式。层间水合Na+离子和被六个基氧包围的脱水Na+离子对Na-云母的离子电导率有贡献，而八面体Na+离子和被拉入双三角孔内部的Na+离子对Na-云母的离子电导率几乎没有贡献。此外，由于四硅云母与层间阳离子之间的静电结合力弱于三硅云母，因此四硅云母中的Na+离子比三硅云母中的Na+离子更容易迁移。
In this study, the influence of the negative charge distribution and the locations of Na+ ions on ionic conductivity of Na-micas was investigated. The locations of Na+ ions in as-prepared Na-micas and heated Na-micas at 700 C were determined in details using X-ray diffraction analyzer, Fourier transform infrared spectrophotometer, 23Na magic angle spinning nuclear magnetic resonance and X-ray photoelectron spectroscopy. As the results, four kinds of Na+ ions, such as Na+ ions induced into vacant sites in the octahedral sheets, hydrated Na+ ions in the interlayer, dehydrated Na+ ions surrounded by six basal oxygens and Na+ ions drawn into the inside of the ditrigonal hole, were found in Na-micas. Ionic conductivities of the heated Na-micas were measured at 400 to 600 C by an alternating current four-probe method. Among the Na-micas, Na-taeniolite showed the maximum ionic conductivity, which was 6.61× 10− 4 S/cm at 600 C. Following relationships were obtained from the results. The hydrated Na+ ions in the interlayer and the dehydrated Na+ ions surrounded by six basal oxygens contributed to the ionic conductivity of Na-mica, while the octahedral Na+ ions and the Na+ ions drawn into the inside of the ditrigonal hole hardly contribute to the ionic conductivity. In addition, because tetrasilisic type mica had weaker electrostatic bonding force between layer and interlayer cation than trisilisic type mica, the Na+ ions of tetrasilisic type mica were migrated more easily than that of trisilisic type mica.