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Pure Appl. Chem.,
Vol. 72, No. 3, pp. 463-477, 2000
COMMISSION ON HIGH TEMPERATURE MATERIALS AND SOLID
Thermodynamic characterization of high-temperature
superconductors in the yttrium-barium-copper-oxygen system. The Y123
solid solution (Technical Report)
G. F. Voronin
Moscow State University, Department of Chemistry, 119899,
Abstract: The aim of this report is to inform the chemical
community about a self-consistent thermodynamic data set for the YBa2
0) solid solution, that is well known as the Y123 phase and possesses
superconducting properties at z~1 and low temperatures. About
3300 experimental points obtained in 240 miscellaneous experiments published
in 78 papers have been processed simultaneously in order to obtain the
most reliable Gibbs energy function of the Y123 phase in the temperature
range from 250 to 1300 K and pressures up to 100 kbar. A function is
recommended for approximation of the Gibbs energy, which has 16 adjustable
parameters. All other thermodynamic properties of the Y123 solution,
including the conditions for its internal stability, can be derived
from the assessed Gibbs energy. Brief descriptions of the thermodynamic
model, experimental and data assessment methods as well as examples
of self-consistent thermodynamic data applications are given.
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