Orientational disorder of C[sub 60] in Li[sub 2]CsC[sub 60]
- Fundamental Research Labs., Tsukuba (Japan)
- Univ. of Sussex, Brighton (United Kingdom)
- Birkbeck College, London (United Kingdom)
The x-ray diffraction of the nonsuperconducting ternary fulleride Li[sub 2]CsC[sub 60] reveals at room temperature a face-centered-cubic (Fm3m) disordered structure that persists to a temperature of 13 Kelvin. The crystal structure is best modeled as containing quasispherical [radius of 3.556(4) angstroms] C[sup 3[minus]][sub 60] ions, in sharp contrast to their orientational state in superconducting face-centered-cubic K[sub 3]C[sub 60] (merohedral disorder) and primitive cubic Na[sub 2]CsC[sub 60] (orientational disorder). The orientational disorder of the carbon atoms on the C[sup 3[minus]][sub 60] sphere was analyzed with symmetry-adapted spherical-harmonic functions. Excess atomic density is evident in the (111) directions, indicating strong bonding Li[sup +]-C interactions, not encountered before in any of the superconducting alkali fullerides. The intercalate-carbon interactions and the orientational state of the fullerenes have evidently affected the superconducting pair-binding mechanism in this material.
- OSTI ID:
- 7243657
- Journal Information:
- Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 264:5163; ISSN SCIEAS; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CARBON
CESIUM COMPOUNDS
CRYSTAL STRUCTURE
ELEMENTS
FULLERENES
LITHIUM COMPOUNDS
NONMETALS
SUPERCONDUCTORS