Carbon Miscibility in the Boron Layers of the MgB 2 Superconductor
2002; American Chemical Society; Volume: 14; Issue: 9 Linguagem: Inglês
10.1021/cm020308k
ISSN1520-5002
AutoresIsabelle Maurin, Serena Margadonna, Kosmas Prassides, Taishi Takenobu, Yoshihiro Iwasa, Andrew N. Fitch,
Tópico(s)Hydrogen Storage and Materials
ResumoA detailed structural analysis of the MgB2-xCx series at low doping levels (0 ≤ x ≤ 0.1) is presented. High-resolution synchrotron X-ray powder diffraction experiments show an extremely small miscibility of carbon within the boron sheets despite the structural analogy between MgB2 and graphite. Multiphase behavior is detected for x ≥ 0.04. The coexisting phases, isostructural with the parent MgB2 compound, differ mainly in their in-plane lattice constants, as evidenced by the splitting of the (hk0) Bragg reflections. All phases contain carbon in substitution for boron but in different concentrations.
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