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Title: Characteristic spherulitic microstructure in partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}

Abstract

The microstructure of partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2} has been studied by transmission electron microscopy. A characteristic spherulitic microstructure is formed in the system. A model for the growth mechanism has been proposed. The critical heterogeneous nucleation of the YBa{sub 2}Cu{sub 3}O{sub x} phase appears to occur from the melt in an epitaxially controlled manner on CuO particles. Subsequent growth of YBa{sub 2}Cu{sub 3}O{sub x} platelets from the nucleus region is repeatedly interrupted by the nucleation of hafnium-rich phases in the liquid at the solid-liquid interface in a manner that again appears to be epitaxially controlled and that promotes the splay of the c orientation of the YBaCuO grain.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
OSTI Identifier:
20075978
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; HAFNIUM OXIDES; NUCLEATION; INTERFACES; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Yan, Y., Evetts, J.E., Zhang, J., and Stobbs, W.M. Characteristic spherulitic microstructure in partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}. United States: N. p., 2000. Web.
Yan, Y., Evetts, J.E., Zhang, J., & Stobbs, W.M. Characteristic spherulitic microstructure in partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}. United States.
Yan, Y., Evetts, J.E., Zhang, J., and Stobbs, W.M. Mon . "Characteristic spherulitic microstructure in partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}". United States.
@article{osti_20075978,
title = {Characteristic spherulitic microstructure in partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2}},
author = {Yan, Y. and Evetts, J.E. and Zhang, J. and Stobbs, W.M.},
abstractNote = {The microstructure of partial-melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/HfO{sub 2} has been studied by transmission electron microscopy. A characteristic spherulitic microstructure is formed in the system. A model for the growth mechanism has been proposed. The critical heterogeneous nucleation of the YBa{sub 2}Cu{sub 3}O{sub x} phase appears to occur from the melt in an epitaxially controlled manner on CuO particles. Subsequent growth of YBa{sub 2}Cu{sub 3}O{sub x} platelets from the nucleus region is repeatedly interrupted by the nucleation of hafnium-rich phases in the liquid at the solid-liquid interface in a manner that again appears to be epitaxially controlled and that promotes the splay of the c orientation of the YBaCuO grain.},
doi = {},
journal = {Journal of the American Ceramic Society},
issn = {0002-7820},
number = 5,
volume = 83,
place = {United States},
year = {2000},
month = {5}
}