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Structure and Defects of Shock-Processed Ti and Y-Based Copper Oxide Superconductors

Published online by Cambridge University Press:  21 February 2011

R. Sharma ,
B. L. Ramakrishna ,
Z. Iqbal ,
N. N. Thadhani  and
N. Chawla
R. Sharma
Affiliation:
Department of Chemistry and Center for Solid State Science, Arizona State University, Tempe, AZ 85287.
B. L. Ramakrishna
Affiliation:
Department of Chemistry and Center for Solid State Science, Arizona State University, Tempe, AZ 85287.
Z. Iqbal
Affiliation:
Allied Signal Inc., Research and Technology, Morristown, NJ 07962
N. N. Thadhani
Affiliation:
Center for Explosives Technology Research, New Mexico Institute of Mining and Technology, Socorro, NM 87801.
N. Chawla
Affiliation:
Center for Explosives Technology Research, New Mexico Institute of Mining and Technology, Socorro, NM 87801.
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Abstract

We have studied the micro-structure of shock synthesized Tl2Ba2CuO6, shockprocessed YBa2Cu3O7 and 10% Ag-YBa2Cu3O7. The structural interpretation of the defects observed in these materials is discussed and compared with computer simulated images. Two planar defects with a stacking sequence of Cu-Ba-Tl-Ba-Cu and Cu-Ba-Tl-Tl-Ba-Cu-Tl-Cu-Ba-Tl-Tl-Ba-Cu in the Tl based oxide and a new defect sequence of Cu-Ba-Cu-Y-Y-Cu-Ba-Cu in the Y based oxides are reported here. An attempt is made to relate the change in superconducting properties observed to the defect structure present.

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