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Mechano-Chemical Effects of High-Energy Attrition Milling On The Bi2Sr2CaCu2Ox Superconductor

Published online by Cambridge University Press:  25 February 2011

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

The mechano-chemical effects of high-energy attrition milling on the microstructure evolution and superconducting properties of Bi2Sr2CaCu2Ox oxide powder were investigated by a combination of x-ray diffraction, scanning electron microscopy, and magnetization techniques. The powder was attrition-milled under an argon atmosphere, using a standard laboratory attritor with yittria-stabilized ZrO2 balls having a ball-to-powder weight ratio of ∼10:1. After selected time increments the mechanical attrition was interrupted and a small quantity of the milled powder was removed for analysis. The results indicate that (1) the crystal size decreases, (2) this decrease in crystal size is accompanied by degradation of crystallinity of the powder and accumulation of atomic-level strain, (3) the Bi-2212 phase decomposes under conditions of excessive deformation, and (4) the superconducting transition is depressed from 70 K to 60 K in the early stages of milling and completely vanishes upon prolonged deformation. The influence of defects (created during cold work) on the current carrying capacity is also presented and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 55
Copyright
Copyright © Materials Research Society 1993

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References

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