O. Zhou, Q. Zhu, G. B. M. Vaughan, J. E. Fischer, P. A. Heiney, N. Coustel, J. McCauley Jr., A. B. Smith III, and D. E. Cox, in Novel Forms of Carbon, edited by C. L. Renchler, J. J. Pouch and D. M. Cox (MRS Symposium Proceedings 270), 191-196 (1992).
The temperature dependent structural evolutions of RbxC60 (x=3,5,6) and K4C60 were studied using both in-house and synchrotron x-ray powder diffraction and thermal analysis techniques over a temperature range of 110K-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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