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Orientational ordering in C70. Evidence for three distinct phase transitions

Ramasesha, Sheela K and Singh, AK and Seshadri, Ram and Sood, AK and Rao, CNR (1994) Orientational ordering in C70. Evidence for three distinct phase transitions. In: Chemical Physics Letters, 220 (3-5). pp. 203-206.

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Official URL: http://dx.doi.org/10.1016/0009-2614(94)00161-8


Variable-temperature X-ray diffraction studies of C70 suggest the occurrence of two phase transitions around 350 and 280 K where the high-temperature phase is fcc and the low-temperature phase is monoclinic, best described as a distorted hcp structure with a doubled unit cell; two like-phases (possibly hcp) seem to coexist in the 280-350 K range. Application of pressure gives rise to three distinct transitions associated with characteristic pressure coefficients, the extrapolated values of the transition temperatures at ambient pressure being around 340, 325 and 270 K. Pressure delineates closely related phases Of C70 just as in the case Of C60 which exhibits two orientational phase transitions at high pressures.

Item Type: Journal Article
Publication: Chemical Physics Letters
Publisher: Elsevier science
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 08 Apr 2011 10:31
Last Modified: 08 Apr 2011 10:31
URI: http://eprints.iisc.ac.in/id/eprint/36669

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