TY - JOUR
T1 - Microstructure characterization of YBa2Cu3O7-y thin film derived from the metal (Y, Ba, and Cu) naphthenates gels coated on the SrTiO3 (100) substrate
AU - Ma, X. L.
AU - Hirayama, T.
AU - Yamagiwa, K.
AU - Hirabayashi, I.
AU - Ikuhara, Y.
N1 - Funding Information:
We would like to thank Dr. J. Yuan, a visiting scientist from Cavendish Laboratory, University of Cambridge, for constructive comments on this manuscript, and Dr. J.G. Wen of ISTEC, Tokyo, for sending a number of reprints of his recent publications on superconducting films. We are also indebted to Mr. Y. Sugawara for helpful guidance during the cross-sectional specimen preparation. Financial support from the New Energy and Industrial Technology Development Organization (NEDO) is gratefully acknowledged.
PY - 1998/9/20
Y1 - 1998/9/20
N2 - By postdeposition annealing at temperature range from 650-850°C in the gas mixture containing O2 and Ar with the oxygen partial pressure of p(O2) = 10-4 atm, thin films of YBa2Cu3O7-y (Y123) have been derived from the metal (Y, Ba, Cu) naphthenates gels spin-coated on the SrTiO3 (100) substrate. The film derived at 700°C has been characterized by means of cross-sectional high resolution electron microscopy (HREM) so as to clarify the details of the microstructures in the derived films. The epitaxial c-axis, a-axis and then nonepitaxial Y123 polycrystal layers were observed successively from the lower to the upper part of the film. The c-axis Y123 thin film, thickness range from 10 nm to 60 nm, was epitaxially formed on the substrate and the a-axis island-shaped grains generated from the c-axis film. The 90° oriented a-and c-axis Y123 grains were found to form meandering grain boundaries; another 90° domain was formed from two differently oriented a-axis grains in which their b- and c-axis are alternatively parallel to each other. A small amount of poly-crystallized Y123 embedded in the amorphous were observed in the upper part of the film.
AB - By postdeposition annealing at temperature range from 650-850°C in the gas mixture containing O2 and Ar with the oxygen partial pressure of p(O2) = 10-4 atm, thin films of YBa2Cu3O7-y (Y123) have been derived from the metal (Y, Ba, Cu) naphthenates gels spin-coated on the SrTiO3 (100) substrate. The film derived at 700°C has been characterized by means of cross-sectional high resolution electron microscopy (HREM) so as to clarify the details of the microstructures in the derived films. The epitaxial c-axis, a-axis and then nonepitaxial Y123 polycrystal layers were observed successively from the lower to the upper part of the film. The c-axis Y123 thin film, thickness range from 10 nm to 60 nm, was epitaxially formed on the substrate and the a-axis island-shaped grains generated from the c-axis film. The 90° oriented a-and c-axis Y123 grains were found to form meandering grain boundaries; another 90° domain was formed from two differently oriented a-axis grains in which their b- and c-axis are alternatively parallel to each other. A small amount of poly-crystallized Y123 embedded in the amorphous were observed in the upper part of the film.
KW - Metal naphthenates gels
KW - SrTiO (100) substrate
KW - YBaCuO thin film
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U2 - 10.1016/S0921-4534(98)00393-1
DO - 10.1016/S0921-4534(98)00393-1
M3 - Article
AN - SCOPUS:0032154476
VL - 306
SP - 245
EP - 252
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -