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Single Crystal Growth of YBa2Cu4O8 and Y2Ba4Cu7O15 Under High Oxygen Pressure

Published online by Cambridge University Press:  15 February 2011

T. Miyatake ,
T. Takata ,
K. Yamaguchi ,
K. Takamuku ,
N. Koshizuka ,
S. Tanaka ,
K. Shibutani ,
S. Hayashi ,
R. Ogawa  and
Y. Kawate
T. Miyatake
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
T. Takata
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
K. Yamaguchi
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
K. Takamuku
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
N. Koshizuka
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
S. Tanaka
Affiliation:
Superconductivity Research Lab., ISTEC, Tokyo 135, Japan.
K. Shibutani
Affiliation:
Superconducting & Cryogenic Tech. Center, Kobe Steel, Ltd., Kobe 651–22, Japan.
S. Hayashi
Affiliation:
Superconducting & Cryogenic Tech. Center, Kobe Steel, Ltd., Kobe 651–22, Japan.
R. Ogawa
Affiliation:
Superconducting & Cryogenic Tech. Center, Kobe Steel, Ltd., Kobe 651–22, Japan.
Y. Kawate
Affiliation:
Superconducting & Cryogenic Tech. Center, Kobe Steel, Ltd., Kobe 651–22, Japan.
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Abstract

We investigate the crystal growth of YBa2Cu4O8 (124) and Y2Ba4Cu7O15 (247) in Al2O3 crucibles at an oxygen partial pressure of 20MPa employing an O2- HIP apparatus in a mixed gas environment of Ar-20%O2. Various melts compositions, rich in Ba and Cu, are explored to optimize crystal growth of 124. Large 124 single crystals up to a size of 1×0.5×0.05mm3 are obtained from compositions with about 65˜67%CuO. 247 single crystals having a maximum size of 3×1.5×0.05mm3 are grown from the same composition of melts. 124 crystals exhibit superconductivity at 75K. 247 crystals show Tc of 20K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 319
Copyright
Copyright © Materials Research Society 1992

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References

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