Phase separation in carbon-doped MgB2 superconductors

I. Maurin, S. Margadonna, K. Prassides, T. Takenobu, T. Ito, D. H. Chi, Y. Iwasa, A. Fitch

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34 Citations (Scopus)


High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB2-xCx (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB2-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB2 compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalPhysica B: Condensed Matter
Issue number4
Publication statusPublished - 2002 Jun


  • Carbon doping
  • MgB superconductor
  • Phase separation
  • X-ray diffraction


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