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Phase diagram, structure, and disorder in C60 below 300 K and 1 GPa
Umeå University, Faculty of Science and Technology, Physics.
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: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 93, no 2, 109-112 p.Article in journal (Refereed) Published
Abstract [en]

Earlier structural studies have shown that the pentagon-to-hexagon orientation ratio in the orientationally ordered simple cubic phase of C60 decreases under pressure. From anomalies observed in the compressibility and thermal conductivity of C60 under pressure we have deduced a pressure-temperature phase diagram for this substance in the range below 300 K and 1 GPa (10 kbar). We conclude that C60 forms a new, completely “hexagon” ordered structural phase above about 0.6 GPa at 150 K (1.2 GPa at 300 K), and that the glass transition shifts upwards in T under pressure by 54 K GPa−1. However, above 0.1 GPa, pentagon-to-hexagon orientation relaxation seems to occur on heating at an almost pressure independent temperature near 100 K.

Place, publisher, year, edition, pages
Elsevier Science Ltd , 1995. Vol. 93, no 2, 109-112 p.
Keyword [en]
Fullerenes, C60, high pressure, phase diagram, orientational state, molecular orientation, rotational transition, glass transition, bulk modulus, compressibility, thermal conductivity, orientational relaxation
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-26338DOI: 10.1016/0038-1098(94)00750-0OAI: oai:DiVA.org:umu-26338DiVA: diva2:241907
Available from: 2009-10-06 Created: 2009-10-06 Last updated: 2017-12-13

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