Abstract
The application of high-temperature YBa2Cu3O7−δ (YBCO) superconducting material is a considerable prospect for the growing energy shortages. Here, SmBiO3 (SBO) films were deposited on (100)-orientated yttrium-stabilized zirconia (YSZ) simple crystal substrates via the chemical solution deposition (CSD) approach for coated conductors, and the effects of sintering oxygen partial pressure on SBO films were studied. The crystalline structures and surface morphologies of SBO films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscope (AFM). The optimized growth temperature, the intensity ratios of the SBO (200) peak to the SBO (111) peak, and the crystallinities of SBO films increased with the sintering oxygen partial pressure. The SEM and AFM images displayed a smooth and well-distributed surface in the argon atmosphere. The subsequent YBCO films with superconducting transition temperatures (Tc = 89.5 K, 90.2 K, and 86.2 K) and critical current densities (Jc = 0.88 MA/cm2, 1.69 MA/cm2, and 0.09 MA/cm2; 77 K, self-field) were deposited to further check the qualities of the SBO layer. These results indicated that sintering oxygen partial pressure had an effect on the epitaxial growth of the SBO buffer layer and YBCO superconducting properties. The experimental results may be a usable reference for the epitaxial growth of YBCO-coated conductors and other oxides.
Highlights
As a kind of high-temperature superconducting material, YBa2 Cu3 O7−δ (YBCO)-coated conductors may be more widely used in the future than Bi-based superconducting tapes because of its higher current-carrying capability and larger irreversibility fields [1]
Ni-based alloy tape with yttrium-stabilized zirconia (YSZ) seed layer deposited via an ion beam assisted deposition (IBAD) route is a textured substrate suited for coated conductors [6]
SBO buffer layers sintered in different oxygen partial pressures on (100)-oriented YSZ simple crystal substrates were obtained via the chemical solution deposition (CSD) methods, and the effect of the sintering oxygen partial pressure on SBO buffer layers was systematically discussed
Summary
As a kind of high-temperature superconducting material, YBa2 Cu3 O7−δ (YBCO)-coated conductors may be more widely used in the future than Bi-based superconducting tapes because of its higher current-carrying capability and larger irreversibility fields [1]. The essential characteristics of superconducting weak coupling at the grain boundary require the deposition of YBCO films on biaxial textured flexible tape. Coated conductors are mainly composed of a textured substrate, a buffer layer, and a superconducting layer. There are two practical routes to obtain textured substrates: rolling assisted biaxially textures (RABiTS) [2,3] and ion beam assisted deposition (IBAD) [4,5,6]. Ni-based alloy tape with yttrium-stabilized zirconia (YSZ) seed layer deposited via an IBAD route (named IBAD-YSZ tape) is a textured substrate suited for coated conductors [6]. The indispensable buffer layers are added between the substrate and the superconducting layer to provide an oxygen diffusion barrier for Ni and an oriented lattice-matched surface for YBCO epitaxial
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