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Crystallization and in-plane alignment behavior of YBa2Cu3O7−y films on MgO(001) prepared by the dipping-pyrolysis process

Published online by Cambridge University Press:  03 March 2011

T. Manabe ,
I. Yamaguchi ,
S. Nakamura ,
W. Kondo ,
T. Kumagai  and
S. Mizuta
T. Manabe
Affiliation:
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305, Japan
I. Yamaguchi
Affiliation:
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305, Japan
S. Nakamura
Affiliation:
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305, Japan
W. Kondo
Affiliation:
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305, Japan
S. Mizuta
Affiliation:
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305, Japan
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Abstract

The effects of annealing temperature and oxygen partial pressure [p(O2)] were investigated on the crystallization and orientation of YBa2Cu3O7−y (YBCO) films on MgO(001) prepared by the dipping-pyrolysis process. The c-axis oriented films without in-plane alignment were prepared by annealing in the YBCO-unstable region, i.e., at low initial p(O2) of 10−4−10−3 atm and 950 °C followed by O2 treatment, through intermediate Y2BaCuO5 and liquid phase. In-plane aligned c- or c/a-axis films were prepared by similar heat treatment with an initial p(02) of 10−4 atm and 900–925 °C through a mixture of BaCu2O2 and YBa3Cu2O6+x. In contrast, nonoriented YBCO films were obtained by annealing at higher initial p(O2)'s and lower temperatures, i.e., by direct reaction among Y2O3, BaCO3, and CuO.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 7 , July 1995 , pp. 1635 - 1643
Copyright
Copyright © Materials Research Society 1995

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References

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