Texturing of high-T_csuperconductors

Abstract

Most of the potential applications of the high-temperature superconductors require large critical currents, much higher than those obtained using a classical sintering process. This paper reviews different processes and corresponding recent results in the field of texturing high-Tc superconductors in order to align and develop the planes where the current flows easily. Different melt-textured growth methods are discussed from both theoretical and practical viewpoints, and the limitations associated with the diffusion and interface phenomena are introduced. Influence of the process parameters, as well as the microstructure of the precursors and the use of additives in order to enlarge the single domain size and to optimise the superconducting characteristics is discussed. Mechanical texturing and texturing under a magnetic field, as well as combination of both processes, are also considered. Recent results, which appear to be an important breakthrough for the industrial development because of the large crystallization rates are also mentioned.

Effect of mesoscopic inhomogeneities on the critical current of bulk melt-textured YBCO

“…2 process of bulk melt-textured YBCO by introducing of small amounts of CeO 2 and Pt. The amount and optimal size of non-superconducting inclusions required for obtaining a maximal J c in type 2 superconductors and, in particular, in melt-textured YBCO is the subject of wide speculation .…”

Superconducting Materials — A Topical Overview

“…However, the "quick and dirty" version melt-textured 123-HTS bulk material can be grown reproducibly in sizes up to a diameter d = 6 cm even in complex shapes 56 [315], it shows superb magnetic pinning properties and is already tested as high-field permanent magnets, e. g., in magnetic bearings and motors [316]. Strong pinning allows the "freezing" of high magnetic fields, e. g., in single domain cylinders with a diameter of 30 mm an induction of 1.3 T can thus be fixed at 77 K [315], 17 T at 29 K has been demonstrated in-between two such samples [317].…”

Design of a Quantum Source of High-Frequency Gravitational Waves (HFGW) and Test Methodology

“…Very precise thermal gradients and time-temperature processing are involved. The melt-textured techniques and the related different methods are reviewed by Desgardin (1999).…”