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Equation of state of an anisotropic three-dimensional C 60 polymer: The most stable form of fullerene

Equation of state of an anisotropic three-dimensional C 60 polymer: The most stable form of... Fullerite is a solid composed of pseudospherical C 60 molecules with strong covalent intramolecular C-C bonds and weak intermolecular van der Waals interactions. The discovery of their one-dimensional- (1D), 2D-, and 3D-polymerized forms has renewed the interest of compressibility studies of clathrate phases composed of a continuous network of mainly sp 3 carbon atoms. Using accurate x-ray-diffraction measurements performed under high pressure, we report the room-temperature pressure-volume equation of state of anisotropic 3D C 60 polymer up to 35 GPa. A very high bulk modulus of 288 GPa has been extracted from the fitting of the unit-cell volume to a Vinet equation of state and confirms the very high stiffness of this low-density material. Two different linear compressibilities (231 and 320 GPa) were obtained, respectively, along the axial direction and the radial direction of the elliptical Debye-Scherrer diffraction patterns indicating the presence of two types of intermolecular bonds. No phase transition or collapse of the C 60 cages was observed during compression. The pseudo-fcc 3D C 60 polymer remains stable up to 35 GPa and is thus, through multiple intermolecular sp 3 bonding, the most stable form of fullerite. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Equation of state of an anisotropic three-dimensional C 60 polymer: The most stable form of fullerene

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References (29)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.68.193414
Publisher site
See Article on Publisher Site

Abstract

Fullerite is a solid composed of pseudospherical C 60 molecules with strong covalent intramolecular C-C bonds and weak intermolecular van der Waals interactions. The discovery of their one-dimensional- (1D), 2D-, and 3D-polymerized forms has renewed the interest of compressibility studies of clathrate phases composed of a continuous network of mainly sp 3 carbon atoms. Using accurate x-ray-diffraction measurements performed under high pressure, we report the room-temperature pressure-volume equation of state of anisotropic 3D C 60 polymer up to 35 GPa. A very high bulk modulus of 288 GPa has been extracted from the fitting of the unit-cell volume to a Vinet equation of state and confirms the very high stiffness of this low-density material. Two different linear compressibilities (231 and 320 GPa) were obtained, respectively, along the axial direction and the radial direction of the elliptical Debye-Scherrer diffraction patterns indicating the presence of two types of intermolecular bonds. No phase transition or collapse of the C 60 cages was observed during compression. The pseudo-fcc 3D C 60 polymer remains stable up to 35 GPa and is thus, through multiple intermolecular sp 3 bonding, the most stable form of fullerite.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Nov 15, 2003

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