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Preparation of stages 2–4 ternary AlCl3–FeCl3-graphite intercalation compounds

Published online by Cambridge University Press:  03 March 2011

Takeshi Abe
Affiliation:
Institute of Atomic Energy, Kyoto University, Uji, Kyoto 611, Japan
Yasuo Mizutani
Affiliation:
Institute of Atomic Energy, Kyoto University, Uji, Kyoto 611, Japan
Mitsuru Asano
Affiliation:
Institute of Atomic Energy, Kyoto University, Uji, Kyoto 611, Japan
Toshio Harada
Affiliation:
Institute of Atomic Energy, Kyoto University, Uji, Kyoto 611, Japan
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Abstract

Intercalation of AlCl3 into stage 2 FeCl3-graphite intercalation compound (GIC) using an ordinary two-bulb method has been studied by x-ray diffraction. Stages 2, 3, and 4 ternary AlCl3-FeCl3-GlC's are obtained when the temperatures of the stage 2 FeCl3-GIC were set at T (GIC) = 503, 523, and 553 K, respectively, for the AlCl3 intercalate material at T (AlCl3) = 473 K, that is, the vapor pressure of (AlCl3)2 (g) of the main vapor species to be held at p {(AlCl3)2} = 2.4 × 105 Pa. However, for the temperature of the stage 2 FeCl3-GIC at T (GIC) = 573 K, the (AlCl3)2 (g) vapor is found to promote the decomposition of the stage 2 FeCl3-GIC, resulting in the formation of graphite. The decomposition of the stage 2 FeCl3-GIC is considered to take place because the complex AlFeCl6 (g) in the gas phase, which is formed from both (AlCl3)2 (g) and FeCl3 existing at the edge of the FeCl3-GIC, is thermodynamically more stable than the FeCl3 and AlCl3 intercalates in their GIC at p {(AlCl3)2} = 2.4 × 105 Pa and T (GIC) = 573 K.

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Copyright
Copyright © Materials Research Society 1995

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Preparation of stages 2–4 ternary AlCl3–FeCl3-graphite intercalation compounds
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