Volume 56, Number 1, October 2001
|Page(s)||61 - 66|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||01 December 2003|
Pressure evolution of the structure of
School of Chemistry, Physics and Environmental Science
University of Sussex -
Brighton BN1 9QJ, UK
2 Department of Chemistry, University of Cambridge Cambridge CB2 1EW, UK
3 Institute of Materials Science, NCSR "Demokritos" 153 10 Ag. Paraskevi, Athens, Greece
4 Japan Advanced Institute of Science and Technology Tatsunokuchi, Ishikawa 923-1292, Japan
5 European Synchrotron Radiation Facility F-38043 Grenoble, France
Accepted: 12 July 2001
The structural features of the ammoniated (NH3)K3C60 fulleride are studied by synchrotron X-ray powder diffraction as a function of pressure to 6.7 GPa. A superstructure appears at ~1 GPa as a result of orientational ordering of both the C60 and K+-NH3 units (orthorhombic symmetry, space group Fddd). The pressure evolution of the lattice constants reveals a highly compressible, strongly anisotropic structure. The centre-to-centre interfullerene separations of ~10.40 Åin the basal plane are comparable to those in the superconducting cubic analogue, RbCs2C60 and evidently sufficiently short to drive the system superconducting, despite its low crystal symmetry.
PACS: 61.48+c – Fullerenes and fullerene-related materials / 61.10.-i – X-ray diffraction and scattering / 74.70.Wz – Fullerenes and related materials
© EDP Sciences, 2001
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