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Synthesis and thermochemical study of 1 : 2 : 4 phases in the (Y,Gd)–Ba–Cu–O system |
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| Authors: | N I Matskevich T L Popova L -G Johansson P Berastegui |
| Institution: | a Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences 630090 Novosibirsk Russia b Department of Inorganic Chemistry, Chalmers University of Technology and Gothenburg University S-412 96 Gothenburg Sweden |
| Abstract: | Synthesis of the YxGd1?xBa2Cu4O8 phases (x=1; 0.5; 0.75) by special method from nitrates is described in this paper. Dissolution enthalpies of YBa2Cu4O8, Y0.5Gd0.5Ba2Cu4O8, Y0.75Gd0.25Ba2Cu4O8, Y2O3, Gd2O3, CuO, BaCO3 were measured in 6 N HCl at 323 K. On the basis of obtained experimental data, the enthalpies of some reactions with YxGd1?xBa2Cu4O8 were determined. It was established that the above-mentioned 1 : 2 : 4 superconductors were thermodynamically more favourable than mixtures including CuO, YBa2Cu3Ox. It was also established that, according to the obtained data, these phases can react with CO2. |
| Keywords: | Calorimetry Stability Superconductors (Y Gd)–Ba–Cu–O system |
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