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Thermochemistry and High Temperature Thermodynamic Properties of Rare Earth-Alkaline Earth-Copper Oxide Superconductors*

Published online by Cambridge University Press:  28 February 2011

Lester R. Morss ,
David C. Sonnenberger  and
R. J. Thorn
Lester R. Morss
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439
David C. Sonnenberger
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439
R. J. Thorn
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439
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Abstract

Enthalpies of formation of the perovskite-related oxides, La1.85 Sr0.15CuO4, YBa2Cu3Oy, with y = 6.93, 6.69, and 6.47 have been determined at 298.15 K by perchloric acid solution calorimetry. Enthalpies of formation and free energies of reactions with H2 O(g) and CO2 (g) have been evaluated. The partial molar enthalpy of solution of oxygen in YBa2 Cu3Oy has been determined and compared with values derived from measurements or the equilibrium partial vapor pressures of oxygen. The significance of the defect state thermochemistry in conductivity is identified.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 571
Copyright
Copyright © Materials Research Society 1988

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Footnotes

a

Permanent address: Department of Chemistry and Biochemistry, Illinois Benedictine College, Lisle, IL 60532.

*

Work performed under the auspices of the Office of Basic Energy Sciences, Division of Chemical Sciences, U. S. Department of Energy, under contract number W-31–109-ENG-38.

References

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