Number: 1999-049-1-200 [ 990491/200/00 ]
Title: Thermodynamic characterization of high-temperature superconductors
in the yttrium-barium-copper-oxygen system
Task Group
Chairman: G.F. Voronin
Members: M.Chase,
S. Degterov, J.Karpinsky,
and E. Rudnyi
Completion Date: 2007 - project completed
Objective:
The aim of the project is to obtain and recommend for use in chemical
researches, design and practical calculations a set of self-consistent
thermodynamic data for three high-temperature superconductors in the
Y-Ba-Cu-O system.
Description:
This project includes:
(1) critical assessment and accommodation of existing thermodynamic
data for solid phases Y123, Y247, Y124 and liquid solutions of components
(2) analytical representation of the Gibbs energy functions for these
phases, and
(3) computer-assisted optimization analysis to obtain a set of functions
parameters with the best fitting to the experimental results and fulfillment
of thermodynamic relations.
Progress:
The first stage of this project concerning the Y123 solid solution
is completed and the corresponding technical report is published in
Pure
Appl. Chem. 72(3),
pp. 463- 477, 2000
A second paper, titled 'Thermodynamic modeling of superconducting phases
in the yttriumbariumcopperoxygen system' has been
published in 2007 in Physica C: Superconductivity, Vol 454,
Issues 1-2, pp. 70-76 [doi:10.1016/j.physc.2007.01.014]
Project completed
Last update: 10 September 2007
<project announcement published in
Chem.
Int.
23(1) 2001>