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Pressure induced dimerisation of C70

Premila, M and Sundara, CS and Sahu, PCh and Bharathi, A and Hariharan, Y and Muthu, DVS and Sood, AK (1997) Pressure induced dimerisation of C70. In: Solid State Communication, 104 (4). pp. 237-242.


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Solid C70 has been subjected simultaneously to high pressures and temperatures (HPHT), with pressures upto 7.5 GPa and temperatures upto 750°C. X-ray diffraction measurements on the recovered samples indicate that the initial h.c.p. solid C70 transforms to a rhombohedral structure which recovers to an f.c.c. structure on annealing. The associated changes in the intra molecular vibrational modes have been probed through infrared (IR) and Raman measurements. The IR measurements on these HPHT samples show splitting of some of the pristine modes and occurrence of several new modes. These sharp IR modes in the HPHT treated samples, which are seen to be different from that reported for photopolymerised C70, have been attributed to the formation of C70 dimers.

Item Type: Journal Article
Publication: Solid State Communication
Publisher: Elsevier Science Ltd.
Additional Information: Copyright for this article belongs to Elsevier Science Ltd.
Keywords: fullerenes;phase transitions;optical properties
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Feb 2007
Last Modified: 19 Sep 2010 04:13
URI: http://eprints.iisc.ac.in/id/eprint/497

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