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Kubozono, Y. Department of Chemistry, Okayama University
Takabayashi, Y. Department of Chemistry, Okayama University
Kambe, T. Department of Physics, Okayama University
Fujiki, S. Department of Chemistry, Okayama University
Kashino, S. Department of Chemistry, Okayama University
Emura, S. ISIR, Osaka University
The structure and physical properties of two-dimensional polymeric Na4C60 (body-centered monoclinic, space group I2/m) are studied in a wide temperature region from 12 to 300 K at 1 bar, and in a pressure region up to 53 kbar at 300 K. The temperature dependence of lattice constants suggests a structural anomaly below 100 K where the variation of spin susceptibility is observed from electron spin resonance. The thermal expansion of the unit-cell volume V is smaller than that of monomeric Rb3C60 and K3C60. The compressibility of c is larger than that of a and b, which can be well explained by the repulsion between Na ions. The compressibility of the center-to-center distance in the (10(1) over bar) plane is similar to1/3 times smaller that that in the (101) plane, which can be well explained by the formation of the polymer chains. Further, a possibility of a three-dimensional polymerization is discussed on the basis of the pressure dependence of C-60. . .C-60 distances.
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This is the institute's copy, as published in Physical Review B, January 2001, Volume 63, Issue 4, Pages 9.
Publisher URL: http://dx.doi.org/10.1103/PhysRevB.63.045418
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Copyright © 2001 The American Physical Society. All rights reserved.
Physical Review B
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