Effect of TaC microadditions on the microstructure and properties of (Bi,Pb)(2)Sr2Ca2Cu3O10+x superconducting ceramicsстатья
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Аннотация:Information-theoretical approaches are used to assess the effect of nanocrystalline TaC microadditions on the thermodynamic conditions of microstructure evolution in (Bi,Pb)(2)Sr2Ca2Cu3O10+x superconducting ceramics. Optimization analysis of property-structure-composifion relationships indicates that the introduction of TaC makes it possible to raise the midpoint transition temperature T-c of the ceramics by 4 K and their 77-K critical current density j(c) by 1000 A/cm(2). It is shown using information interpretation of multifractal formalism that the optimal TaC content is about 0.14 wt%. At this doping level, the expected increase in Tc is 8 K, and that in j(c) is 1300 Angstrom/cm(2). The crystallite and pore substructures in Bi-2223 ceramics are shown to be correlated.