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Title: Phase Relations in the Ba-Y-Cu-O Films on SrTiO 3 for the Ex Situ BaF 2 Process

Abstract

In situ x-ray diffraction was used to establish the phase relations in high-{Tc} superconductor Ba-Y-Cu-O films grown on SrTiO{sub 3} through the ex situ BaF{sub 2} process. These relations differ from bulk equilibrium phase assemblages in the BaO-Y{sub 2}O{sub 3}-CuO{sub x} system. In particular, BaY2CuO5 (the 'green phase'), a common impurity phase in bulk processing, is absent in the films. Because of the absence of this green phase, the compositional stability field of Ba{sub 2}YCu{sub 3}O{sub 6+x} expands considerably as compared to that of the bulk system, resulting in the tie lines Ba{sub 2}YCu{sub 3}O{sub 6+x}-Y{sub 2}O{sub 3} and Ba{sub 2}YCu{sub 3}O{sub 6+x}-Y{sub 2}Cu{sub 2}O{sub 5}.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. National Institute of Standards and Technology (NIST)
  2. ORNL
  3. Los Alamos National Laboratory (LANL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
OE USDOE - Office of Electric Transmission and Distribution
OSTI Identifier:
931502
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; PHASE STUDIES; SUBSTRATES; STRONTIUM OXIDES; TITANIUM OXIDES; HIGH-TC SUPERCONDUCTORS

Citation Formats

Wong-Ng, W., Levin, I., Otani, M., Vaudin, M., Cook, L. P., Cline, J., Feenstra, Roeland, and Holesinger, T. G. Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the Ex Situ BaF2 Process. United States: N. p., 2007. Web. doi:10.1063/1.2713124.
Wong-Ng, W., Levin, I., Otani, M., Vaudin, M., Cook, L. P., Cline, J., Feenstra, Roeland, & Holesinger, T. G. Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the Ex Situ BaF2 Process. United States. doi:10.1063/1.2713124.
Wong-Ng, W., Levin, I., Otani, M., Vaudin, M., Cook, L. P., Cline, J., Feenstra, Roeland, and Holesinger, T. G. Mon . "Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the Ex Situ BaF2 Process". United States. doi:10.1063/1.2713124.
@article{osti_931502,
title = {Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the Ex Situ BaF2 Process},
author = {Wong-Ng, W. and Levin, I. and Otani, M. and Vaudin, M. and Cook, L. P. and Cline, J. and Feenstra, Roeland and Holesinger, T. G.},
abstractNote = {In situ x-ray diffraction was used to establish the phase relations in high-{Tc} superconductor Ba-Y-Cu-O films grown on SrTiO{sub 3} through the ex situ BaF{sub 2} process. These relations differ from bulk equilibrium phase assemblages in the BaO-Y{sub 2}O{sub 3}-CuO{sub x} system. In particular, BaY2CuO5 (the 'green phase'), a common impurity phase in bulk processing, is absent in the films. Because of the absence of this green phase, the compositional stability field of Ba{sub 2}YCu{sub 3}O{sub 6+x} expands considerably as compared to that of the bulk system, resulting in the tie lines Ba{sub 2}YCu{sub 3}O{sub 6+x}-Y{sub 2}O{sub 3} and Ba{sub 2}YCu{sub 3}O{sub 6+x}-Y{sub 2}Cu{sub 2}O{sub 5}.},
doi = {10.1063/1.2713124},
journal = {Applied Physics Letters},
number = ,
volume = 90,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}