New phases of C60 synthesized at high pressure

Y. Iwasa, T. Arima, R. M. Fleming, T. Siegrist, O. Zhou, R. C. Haddon, L. J. Rothberg, K. B. Lyons, H. L. Carter, A. F. Hebard, R. Tycko, G. Dabbagh, J. J. Krajewski, G. A. Thomas, T. Yagi

Research output: Contribution to journalArticlepeer-review

692 Scopus citations


The fullerene C60 can be converted into two different structures by high pressure and temperature. They are metastable and revert to pristine C60 on reheating to 300°C at ambient pressure. For synthesis temperatures between 300° and 400°C and pressures of 5 gigapascals, a nominal face-centered-cubic structure is produced with a lattice parameter aO = 13.6 angstroms. When treated at 500° to 800°C at the same pressure, C60 transforms into a rhombohedral structure with hexagonal lattice parameters aO = 9.22 angstroms and CO = 24.6 angstroms. The intermolecular distance is small enough that a chemical bond can form, in accord with the reduced solubility of the pressure-induced phases. Infrared, Raman, and nuclear magnetic resonance studies show a drastic reduction of icosahedral symmetry, as might occur if the C60 molecules are linked.

Original languageEnglish (US)
Pages (from-to)1570-1572
Number of pages3
Issue number5165
StatePublished - 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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