ИСТИНА

Bi2Sr2Can-1CunO2n+4+x (n=2, 3) are used for making first generation high-temperature superconducting cables. This technology today is the largest part of the market it. However, the need for large amounts of silver led to believe that this technology is far from ideal. An alternative approach is to obtain oriented films superconductor phase due to texturing of the substrate. This cable has a layered structure consisting foundations, nickel strip, one or more buffer layers, high-temperature superconductor (HTSC) and a protective layer. Already created the first prototypes that transmit current without losses. As HTSC in their used yttrium-barium cuprates. The aim of my work is high-temperature superconducting films obtaining on a biaxial textured substrates. The benefits of bismuth in relation to the yttrium-barium cuprates are higher transition temperature superconducting (110K and 93K for Bi2Sr2Ca2Cu3O10+x and YBa2Cu3O7-y, respectively). The lower melting temperature of bismuth cuprates can be an important factor in the case of melt methods. In this paper we consider two approaches to obtain films of bismuth HTSC. The first is used to preparing powders phases Bi2Sr2Ca1Cu2O8+x and Bi2Sr2Ca2Cu3O10+x. For accurately melting points determine we considered differential thermal analysis (DTA) curves in air and oxygen. It was shown the effect of annealing conditions (temperature and atmosphere) on the behavior of HTSC powder and the substrate based on nickel. The second approach is using precursors of bismuth superconductors. Nitrate and acetate are considered, which can be used in solutions methods. The thermal analysis (TG-DTA) shown the temperature dependence of the precursors expansion. To study the morphology of the films used optical and scanning electron microscopy. The phase composition was confirmed by X-ray analysis.