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Crystal growth of YBa2Cu4O8 and Y2Ba4Cu7O15 under high oxygen pressure

Published online by Cambridge University Press:  29 June 2016

Takayuki Miyatake ,
Tsutomu Takata ,
Koji Yamaguhi ,
Kenshi Takamuku ,
Naoki Koshizuka ,
Shoji Tanaka ,
Kazuyuki Shibutani ,
Seiji Hayashi ,
Rikuo Ogawa  and
Yoshio Kawate
Takayuki Miyatake
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Tsutomu Takata
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Koji Yamaguhi
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Kenshi Takamuku
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Naoki Koshizuka
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Shoji Tanaka
Affiliation:
Superconductivity Research Laboratory, ISTEC, Shinonome, Koto-ku, Tokyo 135, Japan
Kazuyuki Shibutani
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd., Takatsukadai, Nishi-ku, Kobe 651-22, Japan
Seiji Hayashi
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd., Takatsukadai, Nishi-ku, Kobe 651-22, Japan
Rikuo Ogawa
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd., Takatsukadai, Nishi-ku, Kobe 651-22, Japan
Yoshio Kawate
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd., Takatsukadai, Nishi-ku, Kobe 651-22, Japan
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Abstract

We investigate the crystal growth of YBa2Cu4O8 and Y2Ba4Cu7C7O15−σ in Al2O3 crucibles at P(O2) = 20 MPa employing commercial O2-HIP equipment. Large crystals of YBa2Cu4O8 up to 1 × 0.5 × 0.05 mm3 are obtained from starting compositions of about 65–67 mol % CuO. When we use a composition of Y: Ba: Cu = 2:6:15, single crystals of YBa2Cu4O8, free from contamination, are obtained at a growth temperature of 1000°C, and those of the Y2Ba4Cu7O15 phase with Al, having the maximum size of 3 × 1.5 × 0.05 mm3, are obtained at a temperature of 1050°C. YBa2Cu4O8 crystals exhibit a superconducting transition temperature Tc of 75 K. Y2Ba4Cu7O15−σ crystals have a Tc of 20 K because of the contamination of aluminum from the crucible.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 5 - 10
Copyright
Copyright © Materials Research Society 1992

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