On the question of metallic and superconducting poly(carbon diselenide)

Z. Iqbal, Y. Khanna, N. S. Murthy, J. S. Szobota, C. Maleysson, R. H. Baughman, Y. Okamoto, L. S. Choi

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Polymerization of carbon diselenide, CSe2, at 5 kbar and ∼ 100°C has been reported to give a metallic (CSe2)n ladder polymer that superconducts near 6 K at 220 kbar pressure. Using a variety of techniques we find that the material synthesized (showing essentially the same x-ray diffraction pattern as previously published) is not (CSe 2)n but instead consists of a mixture of free, trigonal Se and an amorphous C-Se polymeric composition consistent with the formula (CSe0.5)n. Interestingly, possibly as a consequence of staged reactions during synthesis, the Se phase consists of a mixture of large, aggregated crystallites (∼600 Å in diameter) melting at ∼220°C and nonaggregated small crystallites (∼150-250 Å in diameter) showing a broad melting transition with an endothermic maximum at ∼180°C. Percolation of the C-Se polymeric composition probably provides the high observed electrical conductivity [σ(300 K)≈10-20 S cm-1 and σ(300 K)/σ(8 K)≈2.5] in the presently available samples. The previously reported high pressure superconductivity is probably associated with the free Se phase in the samples, since selenium is a known superconductor in the 6 K and 220 kbar range.

Original languageEnglish (US)
Pages (from-to)4019-4027
Number of pages9
JournalThe Journal of Chemical Physics
Issue number7
StatePublished - 1986
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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