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Praseodymium and high-temperature superconductivity: Thermodynamic, structural, and critical correlations

Published online by Cambridge University Press:  31 January 2011

V. E. Lamberti ,
M. A. Rodriguez ,
J. D. Trybulski  and
A. Navrotsky
V. E. Lamberti
Affiliation:
Princeton Materials Institute and the Department of Geosciences, Princeton University, Princeton, New Jersey 08544
M. A. Rodriguez
Affiliation:
Princeton Materials Institute and the Department of Geosciences, Princeton University, Princeton, New Jersey 08544
J. D. Trybulski
Affiliation:
Princeton Materials Institute and the Department of Geosciences, Princeton University, Princeton, New Jersey 08544
A. Navrotsky
Affiliation:
Princeton Materials Institute and the Department of Geosciences, Princeton University, Princeton, New Jersey 08544
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Abstract

The enthalpies of formation and the partial molar enthalpies of oxidation of polycrystalline LnBa2Cu3Oy (Ln = Pr, Nd, Eu, Gd, Dy, Ho, Tm) and Y1−xPrxBa2Cu3Oy (x = 0.0, 0.1, 0.2, 0.5, 0.8, 0.9, 1.0) have been determined at 298 K by drop-solution calorimetry. The thermodynamic characteristics of Pr123 follow the trends of the trivalent-ion-based Ln123 compounds. The thermodynamic data for the (Y,Pr)123 solid solutions show nonideal solution behavior, but no x-dependent valence instability. The superconducting critical temperatures and the enthalpies of oxidation of the (Y,Pr)123 solid solutions are linearly related.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 5 , May 1996 , pp. 1061 - 1064
Copyright
Copyright © Materials Research Society 1996

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