Quaternary Phase Relations Near YBa2Cu3O6+x in Reduced Oxygen Pressures

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The quatenary phase relations near YBa2Cu3O6+x at 850°C were determined by oxygen coulometric titration and microanalysis. The phase relations change markedly as the oxygen pressure decreases, due primarily to the formation of a liquid phase and a reduced oxide, BaCu2O2. Nine invariant reactions were discovered, including decomposition of YBa2Cu3O6+x into Y2BaCuO5, BaCu2O2 and YBa3Cu2O6+y. The lower limit of oxygen partial pressure at which pure YBa2Cu3O 6+x is stable is 4.0×10−4 atm O2 at 850°C; the lower limit increases in the presence of BaCuO2 and Cu2O impurities. These results indicate that the temperatures used for single crystal growth of YBa2Cu3O6+x could be lowered by using reduced oxygen pressures or, alternatively, that constant temperature crystal growth could be induced by increasing the oxygen partial pressure.
Description
신소재공학과
Publisher
Elsevier Science Bv
Issue Date
1990-05
Language
ENG
Citation

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, v.167, no.0, pp.529-537

ISSN
0921-4534
URI
http://hdl.handle.net/10203/65994
Appears in Collection
NE-Journal Papers(저널논문)
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