Abstract
? 2022 Elsevier B.V.Chemical solution deposition is becoming one of the most promising routes toward cost-effective production of REBa2Cu3O7?z (REBCO) based high temperature superconducting tapes. However, a comprehensive understanding of nucleation and growth for REBCO films with dopants, especially considering low sintering temperature and high reproducibility, is still far from being achieved. In this work, dilute Co was introduced into fluorine-free precursor, and comparison studies of a set of pristine and doped GdBCO films were carried out. Correlation between texture, microstructure and critical current density were established, and nucleation & growth mechanism for doped films were proposed. By comparison, Co doping enables to reduce the textured temperature about 50 ℃ because of the dramatically decreased decomposition temperature of intermediate phase BaCO3, which facilitate Ba-Cu-O liquid phase transformation and thus GdBCO epitaxial growth at lower temperatures. These results bring particular opportunities for fine tuning of the film fabrication process by incorporating dilute impurities in precursors.
NSTL
Elsevier