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Characterization of high-pressure sintered C60 nanowhiskers and C60 powder

Published online by Cambridge University Press:  01 March 2005

Jun-ichi Minato ,
Kun'ichi Miyazawa ,
Tadatomo Suga ,
Hisao Kanda ,
Minoru Akaishi ,
Kazunari Yamaura ,
Eiji Muromachi  and
Hideki Kakisawa
Jun-ichi Minato*
Affiliation:
Ecomaterials Center, National Institute for Materials Science, Tsukuba, 305-0044, Japan
Kun'ichi Miyazawa
Affiliation:
Ecomaterials Center, National Institute for Materials Science, Tsukuba, 305-0044, Japan
Tadatomo Suga
Affiliation:
Department of Precision Engineering, The University of Tokyo, Tokyo 113-8656, Japan
Hisao Kanda
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
Minoru Akaishi
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
Kazunari Yamaura
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba 305-0044, Japan
Eiji Muromachi
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba 305-0044, Japan
Hideki Kakisawa
Affiliation:
Ecomaterials Center, National Institute for Materials Science, Tsukuba 305-0047, Japan
*
a)Address all correspondence to this author. e-mail: MINATO.Junchi@nims.go.jp
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Abstract

C60 nanowhiskers fabricated by liquid–liquid interfacial precipitation method and pristine C60 powder were sintered at 800 °C under 5.5 GPa for 2 h. The specimens showed high micro-Vickers hardness about 1100 kg/mm2 and electrical resistivity as low as several Ωm. Structural characterization by x-ray diffraction, high-resolution transmission electron microscopy, Fourier transform infrared, and Raman spectroscopy revealed that most of C60 molecules were broken to form turbostratic graphite by high-pressure and high-temperature treatment. Comparison with the pristine C60 powder sintered under the same conditions suggests that the structural change depends microscopically on the C60 molecules, but the size and the morphology of the starting material also affect the macroscopic sintering process.

Keywords

FullereneHot pressingMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 742 - 746
Copyright
Copyright © Materials Research Society 2005

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References

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