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Formation mechanism of Y2BaCuO5 pattern in growing YBa2Cu3Oxgrains during melt-infiltration process

Published online by Cambridge University Press:  31 January 2011

Young A. Jee ,
Suk-Joong L. Kang  and
Hyungsik Chung
Young A. Jee
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373–1, Kusong-dong, Yousong-gu, Taejon 305–701, Korea
Suk-Joong L. Kang*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373–1, Kusong-dong, Yousong-gu, Taejon 305–701, Korea
Hyungsik Chung
Affiliation:
Korea Institute of Machinery and Metals, 66, Sangnam-dong, Changwon 641–010, Korea
*
a) Author to whom correspondence should be addressed.
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Abstract

When a melt of BaO and CuO mixture was infiltrated into sintered Y2BaCuO5(211) compact to form YBa2Cu3Ox(123) superconductor, butterfly-like plane patterns of 211-free regions were observed to form within growing 123 grains. In a 123 grain, the 211-free region was found to be a pair of vertex-shared pyramids and 211 entrapped region to be the rest of the bulk of the grain. An observation of patterns and cracks formed within 123 grains revealed the base of the pyramids to be (001) plane. The difference in entrapment, which depends on crystallographic planes and results in the formation of the pattern, was explained by the dihedral angles between 123 and 211. The dihedral angle between a - (or b-) plane and 211, which is believed to be greater than zero degree, might cause the entrapment of 211 particles in a [100] (or [010]) direction. In contrast, the dihedral angle of most probably zero degree between c-plane and 211 inhibited the entrapment. The observed shape of 211 particles in front of a-(or b-) and c-planes supports the above explanation of 211 entrapment to form the butterfly-like patterns. was explained by the dihedral angles between 123 and 211. The dihedral angle between a- (or b-) plane and 211, which is believed to be greater than zero degree, might cause the entrapment of 211 particles in a [100] (or [010[) direction. In contrast, the dihedral angle of most probably zero degree between c-plane and 211 inhibited the entrapment. The observed shape of 211 particles in front of a-(or b-) and c-planes supports the above explanation of 211 entrapment to form the butterfly-like patterns.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 3 , March 1998 , pp. 583 - 588
Copyright
Copyright © Materials Research Society 1998

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