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

Yu Perlovich,A Shikov,M Isaenkova,N Kalinin,T Gorshkov

doi:10.1155/tsm.24.121

Abstract

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 initial ceramic powder, cyclic treatment of the composites, including pressing and annealing, results in different development 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 powder and transforms gradually into the phase 2223 during heat treatment. The derivative phase 2223, being of practical interest, shows either heritage or scattering of the basal texture in accord with the liquid phase content in the sample under annealing. Mechanisms of texture development in ceramic phases were proposed.A diagram for composites Ag-HTSC-Ag, connecting their phase composition and texture perfection with measured critical current density, is constructed.

Highlights

The anisotropy of properties of HTSC-ceramics, being caused by the crystalline lattice structure, determines the importance of crystallographic texture for attainment of the high current-carrying ability of superconductors
Though the main technological trend in HTSC production is to seek for the sharpest crystallographic texture, it should be taken into account that points of pinning can settle at boundaries and some content ofboundaries with optimal parameters ought to be retained in a superconducting specimen
The plotted direct pole figures (DPF) (001) as well as any other (Figure 1) testify, that the ceramic layer of the investigated samples has an axial texture of basal type, allowing to attain the a b maximal density of electrical current in the conductor plane

Summary

Introduction

The anisotropy of properties of HTSC-ceramics, being caused by the crystalline lattice structure, determines the importance of crystallographic texture for attainment of the high current-carrying ability of superconductors. The plotted DPFs (001) as well as any other (Figure 1) testify, that the ceramic layer of the investigated samples has an axial texture of basal type, allowing to attain the a b maximal density of electrical current in the conductor plane.

Results

Conclusion