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Pressure-induced transformations and optical properties of the 2D-tetragonal polymer of C60 at pressures up to 30 GPa.
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2002 (English)In: Journal of Experimental and Theoretical Physics, ISSN 1063-7761, Vol. 95, no 4, 736-747 p.Article in journal (Refereed) Published
Abstract [en]

The Raman spectra of the two-dimensional tetragonal (2D(T)) polymeric phase of C60 have been studied in situ at pressures up to 30 GPa and room temperature. The pressure dependence of the phonon modes shows an irreversible transformation of the material near 20 GPa into a new phase, most probably associated with the covalent bonding between the 2D polymeric sheets. The Raman spectrum of the high-pressure phase is intense and well resolved, and the majority of modes are related to the fullerene molecular cage. The sample recovered at ambient conditions is in a metastable phase and transforms violently under laser irradiation: the transformed material contains mainly dimers and monomers of C60 and small inclusions of the diamond-like carbon phase. The photoluminescence spectra of the 2D(T) polymer of C60 were measured at room temperature and pressure up to 4 GPa. The intensity distribution and the pressure-induced shift of the photoluminescence spectrum drastically differ from those of the C60 monomer. The deformation potential and the Grüneisen parameters of the 2D(T) polymeric phase of C60 have been determined and compared with those of the pristine material.

Place, publisher, year, edition, pages
American Institute of Physics , 2002. Vol. 95, no 4, 736-747 p.
Keyword [en]
Fullerenes, Raman spectroscopy, high pressure, pressure polymerization, polymer, one-dimnesional, two-dimensional, three-dimensional, Grüneisen parameter, optical phonons, diamond anvil cell, phase transformation, photoluminescence, deformation potential
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-20510DOI: 10.1134/1.1520606OAI: diva2:208844
Simultaneous publication in Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki vol. 122, pages 849-862 (2002).Available from: 2009-03-20 Created: 2009-03-20 Last updated: 2010-01-20

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