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The Microscopic Study of Y-Ba-Cu-O Compound

Published online by Cambridge University Press:  28 February 2011

W. T. Lin ,
H. C. Chu ,
B. H. Chen ,
Y. H. Chang ,
T. S. Chin  and
P. T. Wu
W. T. Lin
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of, China
H. C. Chu
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of, China
B. H. Chen
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of, China
Y. H. Chang
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of, China
T. S. Chin
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of, China
P. T. Wu
Affiliation:
Materials Research Laboratories, ITRI, Hsinchu, Taiwan, Republic of, China
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Abstract

The microstructure of Y-Ba-Cu-O compound, sintered at 950°C for 16h, was examined by using transmission electron microscope(TEM). For the furnace cooling sample, two variants of–orthorhombic YBa2-Cu3O7−x (O-Y123) twins, grown on (110) and (110) planes, respectively, are crystallographically related to the matrix and produce a Widmanstatten morphology. The orientation relationship between the lath twin and the matrix is (001)T//(001) and [100]T//[010]M. The O-Y123 compound is unstable under tne electron irradition. Twin boundaries are identified as S-boundaries. The minor phases as Y2BaCuO5 (Y211) and BaCuO2 were also observed. For the air cooling sample, no superconductivity above 77K was found. The major phase is tetragonal Y123 (T-Y123), while small amount of 0-Y123 is also existent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 927
Copyright
Copyright © Materials Research Society 1988

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References

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