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Zeitschriftenartikel:

V. Antal, K. Zmorayova, J. Kovac, V. Kavecansky, P. Diko, M. Eisterer, H. W. Weber:
"The influence of annealing in flowing argon on the microstructural and superconducting properties of Al doped YBCO bulks";
Superconductor Science and Technology, 23 (2010), S. 065014 - 065020.



Kurzfassung englisch:
The superconducting properties of YBa2(Cu1−xAlx)3O7−δ/Y2BaCuO5 bulk superconductors
with Al concentrations x = 0.0025, 0.005, 0.02 and 0.05 were studied. The influence of
annealing in flowing oxygen (SO) and argon at 800 ◦C with subsequent oxygenation at 400 ◦C
on the superconducting and microstructural properties was investigated. The clearest peak effect
at 77 K was observed at the lowest Al concentration (x = 0.0025) for SO and at the highest
Al concentration (x = 0.05) for annealing in argon. No decrease of the transition temperature,
Tc, with increasing Al concentration was observed for Al doped samples annealed in argon
up to x = 0.02 in contrast to Al doped samples after standard oxygenation, where Tc decreases
continuously with Al concentration. The twin structures and the unit-cell lattice parameters
of the crystals were investigated by optical microscopy and by x-ray diffraction. The results
indicate the possibility of clustering of the Al atoms during annealing in flowing argon at 800 ◦C.
(Some figures in this article are in colour only in the electronic version)


"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1088/0953-2048/23/6/065014

Elektronische Version der Publikation:
http://publik.tuwien.ac.at/files/PubDat_185719.pdf


Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.