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Solvation interaction and ion association in solutions of lithium perchlorate/4-methoxymethyl-ethylene carbonate (MEC) have been studied by using Infrared and Raman spectra as a function of concentration of lithium perchlorate. The splitting of ring deformation band and ring ether asymmetric stretching band, and the change of carbonyl stretching band suggest that there should be a strong interaction between Li^+ and the solvent molecules, and the site of solvation should be the oxygen atom of carbonyl group. The apparent solvation number of Li^+ was calculated by using band fitting technique. The solvation number was decreased from 3.3 to 1.1 with increasing the concentration of LiClO4/MEC solutions. On the other hand, the band fitting for the ClO4^- band revealed the presence of contact ion pair, and free ClO4^- anion in the concentrated solutions. 相似文献
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研究了固相反应法和熔盐法两种制备方法对BiNbO4微波陶瓷的烧结温度、微观形貌、结构和介电性能的影响。实验表明:在添加CuO和V2O5分别为0.1%(质量分数)时,固相反应法在较低的烧结温度下可获得较致密的陶瓷样品,样品表面晶粒呈球状,品质因数与谐振频率的乘积即Q×f值较大,谐振频率温度系数为正值;熔盐法制得的陶瓷样品具有明显的各向异性,晶粒呈棒状,谐振频率温度系数随烧结温度的升高由正值向负值变化,在940℃烧结,介电常数为38,Q×f值为7781 GHz,谐振频率温度系数近零,为0.92×10-6/℃。两种方法制得的陶瓷样品在微波频段介电常数相近。 相似文献
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临近量和偏离量分别指的是从一个顶点v到图G中其它顶点的平均距离的最小值和最大值.与维纳指标类似,临近量和偏离量也是两个距离相关的参量.维纳指标揭示的是图的全局性质,而临近量和偏离量反映的是图的局部性质.在本文中,我们给出了在无三角形图和无四圈图中,最小度、最大度以及围长条件下临近量和偏离量的上界. 相似文献
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应用红外及拉曼光谱研究了不同浓度的四氟硼酸锂在4-乙氧甲基-碳酸乙烯酯溶剂中的离子溶剂化和离子缔合现象。环形变谱带和羰基伸缩振动谱带的分裂,以及骨架环振动谱带的迁移和分裂表明,锂离子与溶剂分子间存在着较强的相互作用,这种相互作用是通过溶剂羰基氧原子实现的。利用光谱拟合技术定量计算了表观溶剂化数。随着电解质锂盐浓度的增加,溶剂化数逐渐由4.32降至1.26。此外,四氟硼酸根v1谱带的分裂表明在高浓度溶液中存在着光谱自由的四氟硼酸根、直接接触离子对和离子对二聚体。 相似文献
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