Europium- and ytterbium-ammonia graphite intercalation compounds
Europium- and ytterbium-ammonia graphite intercalation compounds
复制标题
铕和镱氨石墨插层化合物
DOI：
10.1016/0008-6223(91)90120-8
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发表时间：
1991
期刊：
影响因子：
10.9
通讯作者：
Wang Yalei
中科院分区：
文献类型：
--
作者：
M. Höhne;E. Stumpp;H. Hummel;Wang Yalei
通过Eu-NH3和Yb-NH3溶液的反应合成了铕镱氨石墨插层化合物（REMA-GIC），并通过粉末X射线衍射、热重分析和电子顺磁共振（EPR）光谱进行了表征。提出了一种改进的制备技术。浓青铜色 REMA 溶液发生反应，生成高金属含量的 REMA-GIC，其近似式为 M(NH3)xC8(M=Eu,Yb)。它们由共插金属氨和过量金属组成。如果用稀蓝色 REMA 溶液处理石墨，则可以制备纯的 1、2 和 3 级 REMA-GIC。从稀或浓REMA 溶液中获得的第1 阶段Eu-NH3 和Yb-NH3GIC 的di 值相同，分别为624 pm 和644 pm。讨论了 REMA-GIC 在室温下缺乏 EPR 信号的问题。
Europium- and ytterbium-ammonia graphite intercalation compounds (REMA-GICs) were synthesized by the reaction of Eu-NH3and Yb-NH3solutions and characterized by powder x-ray diffraction, thermogravimetric analysis, as well as electron paramagnetic resonance (EPR) spectra. An improved preparation technique is presented. Concentrated, bronze-coloured REMA solutions react to give REMA-GICs with a high metal content and the approximate formulaM(NH3)xC8(M=Eu,Yb). They consist of cointercalated metal ammine and excess metal. If graphite is treated with dilute blue REMA solutions, pure stage 1, 2, and 3 REMA-GICs can be prepared. Thedivalues of stage 1 Eu-NH3and Yb-NH3GICs obtained from dilute or concentrated REMA solutions are identical and were found to be 624 pm and 644 pm, respectively. The absence of EPR signals for the REMA-GICs at room temperature is discussed.