Synthesis conditions of graphite intercalation compound with Ca in molten Li-Ca alloy and its superconducting characteristics

Masahiro Toyoda; Asami Takenaka; Yoshihiko Takano; Noboru Akuzawa; Akira Yoshida; Yutaka Kaburagi

doi:10.7209/tanso.2008.148

Masahiro Toyoda, Asami Takenaka, Yoshihiko Takano, Noboru Akuzawa, Akira Yoshida, Yutaka Kaburagi

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Keywords: Highly oriented pyrolytic graphite, Intercalation, X-ray diffraction, Superconductivity

JOURNAL FREE ACCESS

2008 Volume 2008 Issue 233 Pages 148-150

DOI https://doi.org/10.7209/tanso.2008.148

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Abstract

Binary intercalation compound CaC₆ was synthesized by soaking the platelet of HOPG into the molten Li-Ca alloy (Li/Ca=4.0) at 350°C for a long soaking (more than 10 days). The C ompound CaC₆ thus synthesized was confirmed to be superconductive with the critical temperature of about 10 K. For the synthesis of the superconductive intercalation compound CaC₆, the crystallinity of the host graphite has to be selected and long soaking in molten Li-Ca alloy is also required. Superconductivity of CaC₆ was supposed to belong in second type.

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