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Compressibility and Structure of C70
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1995 (English)In: Europhysics letters, ISSN 0295-5075, Vol. 30, no 8, 469-474 p.Article in journal (Refereed) Published
Abstract [en]

The compressibility of C70 has been investigated by means of direct piston and cylinder measurements in the temperature range 150 to 365 K and up to 1 GPa. At 296 and 343 K we find a very rapid change of volume with pressure below 0.15 GPa. We tentatively interpret this as a continuous molecular reorientation with pressure, probably resulting in a transformation from a mixture of face-centred cubic (f.c.c.) and rhombohedral (r.h.) phases to mainly pure r.h. phase. At 365 K as well as at 236 K and below we see no anomalies indicating any structural or rotational anomalies in the pressure range investigated. The zero-pressure bulk modulus decreases with increasing temperature, from 13.1 GPa at 185 K to 7.9 GPa at 365 K. Our volumetric measurements confirm a recently proposed phase diagram for C70.

Place, publisher, year, edition, pages
1995. Vol. 30, no 8, 469-474 p.
Keyword [en]
Fullerenes, C70, phase diagram, high pressure, compressibility, bulk modulus, molecular orientation, fcc structure, rhombohedral structure
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-26297DOI: 10.1209/0295-5075/30/8/005OAI: oai:DiVA.org:umu-26297DiVA: diva2:241640
Available from: 2009-10-05 Created: 2009-10-05 Last updated: 2010-01-29

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Lundin, AndersSundqvist, Bertil

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