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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 13, Number 6
BKCSDE 13(6)
June 20, 1992 

Synthesis of Superconductor YBa2Cu4O8 by Pyrolysis of EDTA Complex
Cheol-Mo Jeong, Seung-Ho Mun, Cheol-Hwa Kang, Cheol-Eui Lee, Sang-Seop Yom, Keon Kim*
The superconducting YBa2Cu4O8 was synthesized in oxygen condition at 1 atm. The starting material with 1 : 2 : 4 composition was obtained by pyrolysis of EDTA complex, which was converted to 1-2-3 phase during densification, followed by the 1-2-4 phase recovery at 810℃. The phase presents were identified by XRD, TG, DTA and AC magnetic susceptibility. Our data indicated that considerable amounts of 1-2-4 phase formed but with the 1 : 2 : 3 phase or possibly 2-4-7 as visible. As the P(O2) increased with temperature, impurity peak, CuO (2θ = 38.8), gradually decrease, and we conclude that the 1-2-4 phase is predominant bulk superconductor under the high oxygen pressure.
663 - 665
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