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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 9, Number 4
April 20, 1988 

Degradation Reaction of the 90K Superconductor YBa2Cu3O7-δ in H2O
Jin-Ho Choy*, Sung-Ho Chun, Bae-Whan Kim, Duk-Young Jung, Seung-Tae Hong, Song-Ho Byeon
Degradation of the 90 K superconductor YBa2Cu3O7-δ in water and humid atmosphere were studied and its decomposition products were identified as BaCO3, CuO, Y2(CO3)3·3H2O and O2·XRD analysis, iodometric titration and IR-spectroscopy of the degraded samples suggest that the YBa2Cu3O7-δ decomposes in three steps such as the reduction of Cu3+ to Cu2+, followed by the hydroxylation of Ba2+ and Y3+ via hydration and finally the formation of carbonates through the uptake of ambient CO2.
240 - 243
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