Phase Composition, Texture and Current-Carrying Ability of Ag-HTSC-Ag Three-Layer Conductors

The regularities of phase changes and texture formation in composite superconductors Ag-HTSC-Ag,produced by electrophoretical deposition, are studied. Depending on phase composition of the initialceramic powder, cyclic treatment of the composites, including pressing and annealing, results in differentdevelopment of the basal texture, being necessary for attainment of high critical current density. The basal texture forms primarily in the phase 2212, which prevailed in the initial ceramic powderand transforms gradually into the phase 2223 during heat treatment. The derivative phase 2223, beingof practical interest, shows either heritage or scattering of the basal texture in accord with the liquidphase content in the sample under annealing. Mechanisms of texture development in ceramic phaseswere proposed. A diagram for composites Ag-HTSC-Ag, connecting their phase composition and texture perfectionwith measured critical current density, is constructed.