X-Ray Diffaction Evidence for Nonstoichiometric Rubidium-C60 Intercalation Compounds

doi:10.1126/science.254.5031.545

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Science 25 October 1991:
Vol. 254. no. 5031, pp. 545 - 548
DOI: 10.1126/science.254.5031.545

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X-Ray Diffaction Evidence for Nonstoichiometric Rubidium-C₆₀ Intercalation Compounds

QING ZHU ¹, OTTO ZHOU ¹, NICOLE COUSTEL ¹, GAVIN B. M. VAUGHAN ², JOHN P. MCCAULEY JR. ³, WILLIAM J. ROMANOW ⁴, JOHN E. FISCHER ¹, and AMOS B. SMITH III ³

¹ Materials Science and Engineering Department and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
² Physics Department and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
³ Chemistry Department and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104
⁴ Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104

Powder x-ray diffraction at 300 K on equilibrated samples ofseveral nominal compositions $khgr$ in RbC₆₀ is reported. In additionto the face-centered cubic (fcc) ( $khgr$ = 3, superconducting), body-centeredtetragonal ( $khgr$ = 4), and body-centered cubic (bcc) ( $khgr$ = 6) stoichiometricphases, direct evidence for a dilute fcc doped phase, 0 x c $le$ 1, and for a substoichiometric bcc phase, $khgr$ $sim$ 5, is presented.In contrast, $khgr$ = 3 and $khgr$ = 4 appear to be line phases with nearlyzero solubility of Rb vacancies and interstitials at 300 K.These results are summarized in a provisional binary phase diagram.

Submitted on September 5, 1991
Accepted on September 20, 1991

THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:

Compressibility of M3C60 Fullerene Superconductors: Relation Between Tc and Lattice Parameter.: O. ZHOU, Q. ZHU, J. E. FISCHER, N. COUSTEL, G. B. M. VAUGHAN, P. A. HEINEY, J. P. MCCAULEY JR., and A. B. SMITH III (1992)
Science 255, 833-835
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