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. Chemistry Physics Letters, 220 (3-5). pp. 203-206.

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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 280x2013;350 K range. Application of pressure gives rise to three distinct transitions associated with characteristics 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: Article
Uncontrolled Keywords: Orientational ordering;High pressure;Pressure coefficients
Subjects: PHYSICS > Physics(General)
Depositing User: M/S ICAST NAL
Date Deposited: 05 Sep 2008
Last Modified: 01 Sep 2015 09:40
URI: http://nal-ir.nal.res.in/id/eprint/4840

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