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Synthesis of YBa2Cu3O7−x thin films by three-stage oxidation process from metallic Y–Ba–Cu precursors

Published online by Cambridge University Press:  31 January 2011

Takashi Hase ,
Ryusuke Kita ,
Kenichi Kawaguchi ,
Takeshi Koga  and
Tadataka Morishita
Takashi Hase
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome, 1-Chome, Koto-ku, Tokyo 135, Japan
Ryusuke Kita
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome, 1-Chome, Koto-ku, Tokyo 135, Japan
Kenichi Kawaguchi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome, 1-Chome, Koto-ku, Tokyo 135, Japan
Takeshi Koga
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome, 1-Chome, Koto-ku, Tokyo 135, Japan
Tadataka Morishita
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome, 1-Chome, Koto-ku, Tokyo 135, Japan
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Abstract

Growth behavior of YBa2Cu3O7-x (YBCO) thin films from metallic Y–Ba–Cu precursors was investigated. The precursors were prepared by coevaporation of the constituent metallic sources under ultra-high vacuum conditions, and they were oxidized in a load lock chamber and a tube furnace. The grain size of YBCO and degree of crystallographic orientation of the films increased with decreasing oxygen partial pressure p(O2) during transformation of the precursor into the crystal close to the thermodynamic stability line of YBa2Cu3O6.0 in a p(O2) – 1/T phase diagram. The growth of YBCO crystal is controlled by the oxygen diffusion along the c-axis direction of the crystal. The diffusion coefficient of oxygen is determined as D = 1.94 × 1010 exp(−433 000/RT) (cm2/s).

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1220 - 1225
Copyright
Copyright © Materials Research Society 1993

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References

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