TY - JOUR
T1 - Crystal structure of the (formula presented) superconductors near (formula presented)
AU - Margadonna, Serena
AU - Prassides, Kosmas
AU - Arvanitidis, Ioannis
AU - Pissas, Michael
AU - Papavassiliou, Georgios
AU - Fitch, Andrew N.
PY - 2002
Y1 - 2002
N2 - Precise structural information on the (formula presented) superconductors in the vicinity of (formula presented) 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 (formula presented) is formed. The unusually large width of the (formula presented) superlattice peak implies the presence of microstrain broadening, arising from anisotropic stacking of Al and Mg layers and/or structural modulations within the (formula presented) plane. The ordered phase survives only over a limited range of compositions away from the optimum (formula presented) doping level.
AB - Precise structural information on the (formula presented) superconductors in the vicinity of (formula presented) 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 (formula presented) is formed. The unusually large width of the (formula presented) superlattice peak implies the presence of microstrain broadening, arising from anisotropic stacking of Al and Mg layers and/or structural modulations within the (formula presented) plane. The ordered phase survives only over a limited range of compositions away from the optimum (formula presented) doping level.
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U2 - 10.1103/PhysRevB.66.014518
DO - 10.1103/PhysRevB.66.014518
M3 - Article
AN - SCOPUS:85038347198
VL - 66
SP - 1
EP - 5
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 1
ER -