TY - JOUR
T1 - Crystal structure of the Mg1-xAlxB2 superconductors near x≈0.5
AU - Margadonna, Serena
AU - Prassides, Kosmas
AU - Arvanitidis, Ioannis
AU - Pissas, Michael
AU - Papavassiliou, Georgios
AU - Fitch, Andrew N.
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2002/7/1
Y1 - 2002/7/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.66.014518
DO - 10.1103/PhysRevB.66.014518
M3 - Article
AN - SCOPUS:0036650778
VL - 66
SP - 145181
EP - 145185
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 1
M1 - 014518
ER -