Low-temperature hcp-to-monoclinic structural transition in solid C70: ephemeral nature of the intermediate phase

Ghosh, G. ; Sastry, V. S. ; Sundar, C. S. ; Sengupta, Surajit ; Radhakrishnan, T. S. (1998) Low-temperature hcp-to-monoclinic structural transition in solid C70: ephemeral nature of the intermediate phase Physical Review B: Condensed Matter and Materials Physics, 58 (21). pp. 14094-14097. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v58/i21/p14094_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.58.14094

Abstract

We follow the structural transformation in solid C70 from the high-temperature hcp to a low-temperature monoclinic phase using detailed X-ray diffraction studies at controlled cooling rates from 0.0033 to 0.42 K/min. Rapid cooling of the sample gives the signature of a two-step transformation that disappears when the system is transformed quasistatically. These experimental results can be rationalized using a simple mean field, Langevin dynamical theory using a free-energy functional with minima corresponding to the parent, and two competing product phases such that one of these product phases remains metastable throughout. The implication of our results on the existence of the intermediate phase in the sequence hcp-dhcp-monoclinic, of structural transitions in solid C70 with the lowering of temperature is discussed.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:53191
Deposited On:05 Aug 2011 07:57
Last Modified:05 Aug 2011 07:57

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