Temperature Dependent Structural Studies of K- and RB- Doped C60


The temperature dependent structural evolutions of RbxC60 (x = 3, 5, 6) and K4C60 were studied using both in-house andsynchrotron x-ray powder diffraction and thermal analysis techniques over a temperature range of 10K–673K. The superconducting face centered-cubic (fcc) Rb3C60 and the body centered-tetragonal (bct) M4C60}(M = K, Rb) phases are found to be line compounds in this temperature range, while the body centered-cubic (bcc) phase forms a solid solution in which the solubility of vacant M sites increases with temperature. The orientation of the C60 molecules in the K4C60 phase was analyzed. A crystalline fcc Rb1C60 phase is stable only above room temperature.

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This work is supported by NSF grants no. DMR-88-19885 and no. DMR-89-01219 and by DOE grant no. DEFG02-87ER45254. Research carried out (in part) at the National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Division of Materials Science and Chemical Sciences (DOE contract number DE-AC02-76CH00016). We thank Jon Hanson for technical assistance.

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Correspondence to Otto Zhou or Qing Zhu or Gavin B.M. Vaughan or John E. Fischer or Paul A. Heiney or Nicole Coustel or John Mccauley Jr. or Amos B Smith III or David E. Cox.

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Zhou, O., Zhu, Q., Vaughan, G.B. et al. Temperature Dependent Structural Studies of K- and RB- Doped C60. MRS Online Proceedings Library 270, 191–196 (1992). https://doi.org/10.1557/PROC-270-191

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