Photo-and pressure-induced transformations in the linear orthorhombic polymer of C{sub 60}
- Russian Academy of Sciences, Institute of High Pressure Physics (Russian Federation)
- Aristotle University, Physics Division, School of Technology (Greece)
Stability of the linear orthorhombic polymer of C{sub 60} under pressure and laser irradiation is studied by Raman scattering and X-ray diffraction measurements. The Raman spectrum at ambient pressure remains unchanged, in the time scale of the experiment, up to an intensity of 3200 W/cm{sup 2} of the 514.5 nm line of an Ar{sup +} laser, but irreversible changes are observed at higher intensities. The Raman spectra recorded at increased pressure show similar irreversible changes even at the laser intensity as low as 470 W/cm{sup 2}. The X-ray diffraction and Raman measurements of the pressure-treated samples, performed after pressure release, show that the nonirradiated material does not exhibit any changes in the crystal structure and phonon spectra. This behavior indicates a pressure-enhanced photo-induced transformation to a new polymeric phase characterized by a Raman spectrum that differs from those of the other known polymeric phases of C{sub 60}. The Raman spectra of the phototransformed linear orthorhombic polymer of C{sub 60} were measured at a pressure of up to 29 GPa. The pressure dependence of the Raman mode frequencies show singularities near 4 GPa and 15 GPa, respectively, related to a reversible phase transition and an irreversible transformation to a metastable disordered phase. The diffuse Raman spectrum of the disordered phase does not exhibit substantial changes with an increase in pressure up to 29 GPa. The high-pressure phase transforms to a mixture of pristine and dimerized C{sub 60}, after pressure release and exposure to ambient conditions for 30 h.
- OSTI ID:
- 21241905
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 107, Issue 4; Other Information: DOI: 10.1134/S1063776108100099; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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