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Structural and magnetic characterization of granular Y1Ba2Cu3O7−δ nanocrystalline powders

Published online by Cambridge University Press:  03 March 2011

M. Simoneau ,
G. L'Espérance ,
M.L. Trudeau  and
R. Schulz
M. Simoneau
Affiliation:
Departement de Métallurgie et de Génie des Matériaux, Ecole Polytechnique, Montréal, Québec, Canada, H3C 3A7
G. L'Espérance
Affiliation:
Departement de Métallurgie et de Génie des Matériaux, Ecole Polytechnique, Montréal, Québec, Canada, H3C 3A7
M.L. Trudeau
Affiliation:
Technologie des Matériaux, Institut de Recherche d'Hydro-Québec, 1800 montée Ste-Julie, Varennes, Québec, Canada, J3X 1S1
R. Schulz
Affiliation:
Technologie des Matériaux, Institut de Recherche d'Hydro-Québec, 1800 montée Ste-Julie, Varennes, Québec, Canada, J3X 1S1
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Abstract

High energy ball milling has been used to produce nanocrystalline Y1Ba2Cu3O7-δ powders. These powders are being used as starting materials for manufacturing superconducting textured wires by a solid state recrystallization process. Magnetic and microstructural characterizations were performed as a function of milling time. The milling reduces the average crystal size and creates low and high-angle grain boundaries which increase the granularity of the superconductor. As a result, the long-range order on the oxygen sublattice and on the yttrium and barium sites is destroyed. A transition from orthorhombic to tetragonal and finally to a cubic metastable phase is observed. Total loss of superconductivity occurs after about 1 h of milling. Prior to this time, superconductivity can partially be restored by room-temperature aging. High-temperature heat treatment of the nanocrystalline phase produces a tetragonal structure with c = 3a.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 3 , March 1994 , pp. 535 - 540
Copyright
Copyright © Materials Research Society 1994

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