2015 Fiscal Year Final Research Report
New development of superconductive graphite intercalation compounds - Characterizations of CaC6 and synthesis of MgCx -
| Project/Area Number |
24560830
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tokyo Polytechnic University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Keywords | 黒鉛層間化合物 / 炭素材料 / 超伝導 / 導電性材料 |
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| Outline of Final Research Achievements |
Calcium-graphite intercalation compound (Ca-GIC) has attracted attention because they transition into a superconducting state at higher temperature than other GICs. In this work, Ca-GIC is characterized and compared with conventional GICs such as K-GIC. The metallic character of Ca-GIC was enhanced and its Seebeck coefficient was small. Due to the degradation of its graphitic structure, the Ca-GIC had lower thermal conductivities than other GICs. Furthermore, when lithium from the synthesis of the Ca-GIC remained in the structure, its transition temperature decreased.
Magnesium-GIC (Mg-GIC) has not yet been synthesized, but it is expected to have a higher transition temperature than Ca-GIC. We attempted to synthesize Mg-GIC in this work. Based on the Seebeck coefficients of some of the products of reactions between Mg and graphite, Mg-GIC might have formed in a small area of the graphite. However, we could not confirm the change in structure expected from the formation of Mg-GIC.
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| Free Research Field |
材料化学
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