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Microstructure and superconducting properties of attrition-milled Bi2Sr2CaCu2Ox

Published online by Cambridge University Press:  03 March 2011

J.S. Luo ,
H.G. Lee  and
S.N. Sinha
J.S. Luo
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
H.G. Lee
Affiliation:
University of Illinois at Chicago, Chicago, Illinois 60680
S.N. Sinha
Affiliation:
University of Illinois at Chicago, Chicago, Illinois 60680
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Abstract

The microstructure and superconducting properties of Bi2Sr2CaCu2Ox (Bi-2212) during high-energy attrition milling were investigated in detail by a combination of x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and magnetization techniques. The starting superconducting powder was milled in a standard laboratory attritor using yttria-stabilized ZrO2 balls and a stainless steel tank. After selected time increments, the milling was interrupted and a small quantity of milled powder was removed for further analysis. It was found that the deformation process rapidly refines Bi-2212 into nanometer-size crystallites, increases atomic-level strains, and changes the plate-like morphology of Bi-2212 to granular submicron clusters. At short milling times, the deformation seems localized at weakly linked Bi-O double layers, leading to twist/cleavage fractures along the {001} planes. The Bi-2212 phase decomposes into several bismuth-based oxides and an amorphous phase after excessive deformation. The superconducting transition is depressed by about 10 K in the early stages of milling and completely vanishes upon prolonged deformation. A deformation mechanism is proposed and correlated with the evolution of superconducting properties. The practical implications of these results are presented and discussed.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 297 - 304
Copyright
Copyright © Materials Research Society 1994

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