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

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

doi:10.1103/PhysRevB.66.014518

Crystal structure of the Mg_1-xAl_xB₂ superconductors near x≈0.5

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

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Precise structural information on the Mg_1-xAl_xB₂ 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 1_2, 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 language	English
Article number	014518
Pages (from-to)	145181-145185
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.66.014518
Publication status	Published - 2002 Jul 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.66.014518

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Crystal structure of the Mg_1-xAl_xB₂ superconductors near x≈0.5. / Margadonna, Serena; Prassides, Kosmas; Arvanitidis, Ioannis; Pissas, Michael; Papavassiliou, Georgios; Fitch, Andrew N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 1, 014518, 01.07.2002, p. 145181-145185.

Research output: Contribution to journal › Article › peer-review

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AU - Papavassiliou, Georgios

AU - Fitch, Andrew N.

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Crystal structure of the Mg_1-xAl_xB₂ superconductors near x≈0.5

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