Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia



Advanced Search

Chemistry for Sustainable Development

2004 year, number 2

Optimization of the Solution-Free Process for the Preparation of Superconducting Materials from SmBa2Cu3Oy: Thermodynamic Aspects

NATA I. MATSKEVICH
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia), E-mail: nata@casper.che.nsk.su
Pages: 201-205

Abstract

Thermochemistry of the decomposition reactions of Sm1 + xBa2 - xCu3Oy solid solutions (x = 0-0.8) has been studied by solution calorimetry (2M HCl, 23.15 K). Dependences of the formation enthalpies of these compounds on the samarium content have been obtained. Analysis of the experimental data shows that the Sm1 + xBa2 - xCu3Oy phases can decompose into mixtures of variable composition in both inert and oxygen atmospheres. In an inert atmosphere, decomposition reactions can form mixtures of solid solutions with high samarium contents and barium cuprate. Under oxygen, decomposition can lead either to mixtures of phases with higher and lower samarium contents or to mixtures with high samarium contents and barium cuprate. Decomposition reactions of solid solutions are assumed to increase the critical current. For samples prepared under oxygen, the critical current is admitted to be stronger than for samples synthesized under an inert atmosphere. The results of thermochemical studies will permit optimization of the solution-free process for sample preparation from SmBa2Cu3Oy, which is currently the most promising and widely used technology.