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Thermodynamic instability of the YBa2Cu3O7−x phase at the 1:2:3 composition

Published online by Cambridge University Press:  31 January 2011

Fernando H. Garzon ,
Ian D. Raistrick ,
D.S. Ginley  and
John W. Halloran
Fernando H. Garzon
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Ian D. Raistrick
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D.S. Ginley
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
John W. Halloran
Affiliation:
CPS Superconductor Corporation, Milford, Massachusetts 01757–1746
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Abstract

We have measured enthalpies of formation of YBa2Cu3O7−x, Y2BaCuO5, YBa2Cu4O8, and BaCuO2 using high precision isothermal solution calorimetry. Thermodynamic analysis of the calorimetric data indicates that YBa2Cu3O7−x at the pure-phase composition (1:2:3 cation ratio) is metastable at ≍873 K and 1 atm Po2.

Type
Materials Communications
Information
Journal of Materials Research , Volume 6 , Issue 5 , May 1991 , pp. 885 - 887
Copyright
Copyright © Materials Research Society 1991

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