Compressibility of C60 in the temperature range 150 - 335 K up to a pressure of 1 GPa
1996 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 53, no 13, 8329-8336 p.Article in journal (Refereed) Published
We have measured the volume of nominally 99.9% pure C60 as a function of pressure (p) in both the fcc and sc phases up to 1 GPa over the temperature range 150 to 335 K using a highly accurate piston-and-cylinder technique. At zero pressure, the room-temperature bulk modulus B(0) is 6.8 GPa for the fcc phase and about 8.7–9.5 GPa for the sc phase. For the latter phase, B(0) increases strongly with decreasing temperature to 10.4 GPa at 152 K and for both phases B increases rapidly with increasing pressure. The fcc→sc transformation is always smeared over large ranges in p. Surprisingly, above 200 MPa B is lower in the sc phase than in the fcc phase, which we explain as arising from molecular reorientation with increasing pressure. The formation of a mainly ‘‘hexagon’’-oriented, ordered phase above 0.6 GPa at low T gives rise to observable anomalies in B(p).
Place, publisher, year, edition, pages
1996. Vol. 53, no 13, 8329-8336 p.
Fullerenes, C60, high pressure, compressibility, bulk modulus, elastic properties, phase diagram, phase transition, molecular rotation, molecular orientation, plastic crystal
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-26016DOI: 10.1103/PhysRevB.53.8329OAI: oai:DiVA.org:umu-26016DiVA: diva2:235801