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Effect of Oxygen Pressure on the Phase Transformation in the Y-Ba-Cu-O and Related Superconducting Oxides

Published online by Cambridge University Press:  28 February 2011

Y. Kubo ,
Y. Nakabayashi ,
J. Tabuchi ,
T. Yoshitake ,
T. Manako ,
A. Ochi ,
K. Utsumi ,
H. Igarashi  and
M. Yonezawa
Y. Kubo
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
Y. Nakabayashi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
J. Tabuchi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
T. Yoshitake
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
T. Manako
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
A. Ochi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
K. Utsumi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
H. Igarashi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
M. Yonezawa
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
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Abstract

The orthorhombic-tetragonal YBa2Cu3O7-δ phase boundary in the δ-T diagram was determined by the detailed isobar TG measurement under the oxygen partial pressures of 1 to 0.01 atm. The phase boundary was found not to be located at 5 = const, but to have a slope of dδ/dT∼−4.7 × 10-4K-1. Using the same method, the transformation temperatures of a series of lanthanide substituted systems were measured at 1 atm. O2. The transformation temperature increased with increasing the atomic number of the lanthanide element. All these experimental results are well explained in terms of the order-disorder transformation caused by the repulsion energy between the nearest neighbor oxygen atoms on the Cu plane sandwiched by Ba planes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 89
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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