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Phase transitions in C70 at high pressure: A thermal conductivity study
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1995 (English)In: Fullerenes: Recent Advances in the Chemistry and Physics of Fullerenes and Related Materials, volume 2: Proceedings of the 187th ECS Meeting, Symposium Fullerenes: Chemistry, Physics, and New Directions VII, Reno 1995, Pennington, NJ: The Electrochemical Society , 1995, 881-890 p.Conference paper, Published paper (Refereed)
Abstract [en]

Measurements of the thermal conductivity lambda and the specific heat capacity per unit volume rhocv of polycrystalline C70 were carried out in the temperature range 100 - 450 K under pressures up to 1 GPa. Anomalies have been observed in lambda and rhocv near 300 K on cooling (increasing pressure) indicating a phase transition from a rotationally disordered phase into an ordered phase. The phase boundary for this transition was found to have a slope dT/dp = 70 K/GPa. The temperature dependence of lambda indicates a substantial amount of structural defects in the sample and strong hysteresis effects. We propose a phase diagram describing the probable evolution of orientational structure in T-p space.

Place, publisher, year, edition, pages
Pennington, NJ: The Electrochemical Society , 1995. 881-890 p.
Series
Electrochemical Society Proceedings, PV 95-10
Keyword [en]
Fullerenes, C70, phase diagram, high pressure, thermal conductivity, molecular orientation
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-26363ISBN: 1-56677-104-8 (print)OAI: oai:DiVA.org:umu-26363DiVA: diva2:242111
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2010-01-29

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