Synthesis and thermochemical study of 1 : 2 : 4 phases in the (Y,Gd)–Ba–Cu–O system

Synthesis of the Y x Gd 1− x Ba 2Cu 4O 8 phases ( x=1; 0.5; 0.75) by special method from nitrates is described in this paper. Dissolution enthalpies of YBa 2Cu 4O 8, Y 0.5Gd 0.5Ba 2Cu 4O 8, Y 0.75Gd 0.25Ba 2Cu 4O 8, Y 2O 3, Gd 2O 3, CuO, BaCO 3 were measured in 6 N HCl at 323 K. On the basis of obta...

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Bibliographic Details
Published in:Thermochimica acta 1998-11, Vol.320 (1), p.39-44
Main Authors: Matskevich, N.I, Popova, T.L, Johansson, L.-G, Berastegui, P
Format: Article
Language:English
Subjects:
(Y,Gd)–Ba–Cu–O system
Calorimetry
Stability
Superconductors
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Summary:Synthesis of the Y x Gd 1− x Ba 2Cu 4O 8 phases ( x=1; 0.5; 0.75) by special method from nitrates is described in this paper. Dissolution enthalpies of YBa 2Cu 4O 8, Y 0.5Gd 0.5Ba 2Cu 4O 8, Y 0.75Gd 0.25Ba 2Cu 4O 8, Y 2O 3, Gd 2O 3, CuO, BaCO 3 were measured in 6 N HCl at 323 K. On the basis of obtained experimental data, the enthalpies of some reactions with Y x Gd 1− x Ba 2Cu 4O 8 were determined. It was established that the above-mentioned 1 : 2 : 4 superconductors were thermodynamically more favourable than mixtures including CuO, YBa 2Cu 3O x . It was also established that, according to the obtained data, these phases can react with CO 2.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(98)00483-3