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High-Pressure Studies of the Rotor-Stator Compound C60-Cubane

Published online by Cambridge University Press:  26 February 2011

Bertil Sundqvist ,
Agnieszka Iwasiewicz-Wabnig ,
Eva Kovats  and
Sandor Pekker
Bertil Sundqvist
Affiliation:
bertil.sundqvist@physics.umu.se, Umeå University, Department of Physics, Linnaeus Vag 20, Umeå, S-90187, Sweden, +46 90 786 7488
Agnieszka Iwasiewicz-Wabnig
Affiliation:
agnieszka.iwasiewicz@physics.umu.se, Umea University, Department of Physics, Umea, S-90187, Sweden
Eva Kovats
Affiliation:
kovatse@szfki.hu, Hungarian Academy of Sciences, Research Institute for Solid State Physics and Optics, P.O. Box 49, Budapest, H-1525, Hungary
Sandor Pekker
Affiliation:
pekker@mail.szfki.hu, Hungarian Academy of Sciences, Research Institute for Solid State Physics and Optics, P.O. Box 49, Budapest, H-1525, Hungary
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Abstract

Insertion of cubane (C8H8) into the octahedral voids of the C60 lattice leads to the formation of an interesting rotor-stator compound which can be converted into a C60 co-polymer by heating. We have treated a number of C60·C8H8 samples for up to 3 h each in the range 380-875 K under pressures up to 2 GPa. The resulting materials were investigated by Raman spectroscopy and X-ray diffraction. Depending on treatment conditions, at least five different structural phases can be found. In addition to the four structural phases observed at atmospheric pressure and different temperatures we find that a new polymeric state is created at pressures above 1 GPa, and we tentatively identify its structure as pseudo-orthorhombic. The cubic-orthorhombic phase transition line is found to have a slope of 295 K GPa-1, much larger than the slope of the fcc-sc line in pure C60.

Keywords

Raman spectroscopyx-ray diffraction (XRD)polymerization
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 987: Symposium PP – Materials Research at High Pressure , 2006 , 0987-PP03-04
Copyright
Copyright © Materials Research Society 2007

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References

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