Crystal structure of the Mg1-xAlxB2 superconductors near x≈0.5

Serena Margadonna, Kosmas Prassides, Ioannis Arvanitidis, Michael Pissas, Georgios Papavassiliou, Andrew N. Fitch

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Precise structural information on the Mg1-xAlxB2 superconductors in the vicinity of x≈0.5 is derived from high-resolution synchrotron x-ray powder diffraction measurements. We find that a hexagonal superstructure, accompanied by doubling of the c axis, ordering of Mg and Al in alternating layers, and a shift of the B layers towards Al by ∼0.12 Å, is formed. The unusually large width of the (00 12, superlattice peak implies the presence of microstrain broadening, arising from anisotropic stacking of Al and Mg layers and/or structural modulations within the ab plane. The ordered phase survives only over a limited range of compositions away from the optimum x = 0.5 doping level.

Original languageEnglish
Article number014518
Pages (from-to)145181-145185
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number1
DOIs
Publication statusPublished - 2002 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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