We synthesized Al doped Y(Ca)Ba2Cu3O7Ày (YBCO) whiskers via the solid state reaction method. Al dop- ing was systematically varied in the nominal cationic stoichiometry of YBa2Cu3CaTe0.5AlxO7Ày, with 0 6 x 6 0.5. The amount of the grown whiskers increases for nominal Al addition up to x = 0.05, decreas- ing for larger concentrations. The concentration of Al incorporated in the crystals (x0 ) is always higher with respect to the starting stoichiometry and shows a gradient along its length, with a higher amount at the tip regions. The single crystal diffraction analyses show an increasing tetragonal character with increasing x0 , with a transition from the orthorhombic to the tetragonal system for x0 = 0.13, which is in agreement with the worsening of electrical transport properties and disappearing of superconductivity for x0 = 0.19.

Al doping influence on crystal growth, structure and superconducting properties of Y(Ca)Ba2Cu3O7y whiskers

CALORE, LEANDRO;CAGLIERO, Stefano;AGOSTINO, Angelo;TRUCCATO, Marco;OPERTI, Lorenza
2013

Abstract

We synthesized Al doped Y(Ca)Ba2Cu3O7Ày (YBCO) whiskers via the solid state reaction method. Al dop- ing was systematically varied in the nominal cationic stoichiometry of YBa2Cu3CaTe0.5AlxO7Ày, with 0 6 x 6 0.5. The amount of the grown whiskers increases for nominal Al addition up to x = 0.05, decreas- ing for larger concentrations. The concentration of Al incorporated in the crystals (x0 ) is always higher with respect to the starting stoichiometry and shows a gradient along its length, with a higher amount at the tip regions. The single crystal diffraction analyses show an increasing tetragonal character with increasing x0 , with a transition from the orthorhombic to the tetragonal system for x0 = 0.13, which is in agreement with the worsening of electrical transport properties and disappearing of superconductivity for x0 = 0.19.
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http://www.sciencedirect.com/science/article/pii/S0925838812014636
Oxide superconductors; YBCO whiskers; superconductivity; Powders-solid state reaction; growth mechanism; aluminum addition
L. Calore; M.M. Rahman Khan; S. Cagliero; A. Agostino; M. Truccato; L. Operti
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/133117
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