Growth and Properties of YBCO-Coated Conductors Fabricated by Inclined-Substrate Deposition

Abstract

YBCO-coated conductors with high current-carrying capability are desirable for electric power transmission applications. Inclined-substrate deposition (ISD) is capable of producing high-quality biaxially textured template films, which are important for fabrication of YBCO-coated conductors. We have grown biaxially textured ISD-MgO template films on flexible metallic substrates at deposition rates of 2-10 nm/sec. Columnar grains with a roof-tile-shaped surface structure were observed on the ISD-MgO films. X-ray pole figure analysis revealed that the ISD-MgO film is biaxially textured and its c-axis is titled at an angle from the substrate normal. Strontium ruthenium oxide (SRO) buffer films were epitaxially grown on ISD-MgO by pulsed laser deposition prior to the deposition of YBCO. Low -scan full-width at half maximum (FWHM) values of 6 and 7 were observed for YBCO and SRO, respectively. T c of 91 K with a sharp transition and transport J c over 1.4 MA cm 2 at 77 K in self-field were measured on YBCO coated conductors grown with ISD MgO architectures using a SRO buffer.Index Terms-Coated conductor, inclined-substrate deposition, pulsed laser deposition, SRO buffer, YBCO thin film.

Prospects for the fabrication of low aspect ratio coated conductors by inclined substrate deposition

“…An ISD-MgO film deposited by e-beam evaporation on a flat substrate exhibits biaxial texture with the c-axis tilted away from the substrate normal. We reported the texture formation mechanism and the dependence of biaxial alignment on processing parameters in our earlier publications [10,11,22]. Some important results are recaptured here to illustrate the fact that biaxially textured ISD-MgO films can be grown with a wide range of inclination angle, and therefore, unlike IBAD or RABiTS, the ISD process is applicable to production of biaxially textured template films on round-wire surfaces.…”

“…The tilt angle β is also strongly affected by the inclination angle α. It increases with increasing inclination angle α when α > 30 • [22]. The results obtained on ISD-MgO films deposited on flat substrate indicate that well-textured template films can be grown with a wide range of inclination angles when α > 30 • .…”

Thickness Effect on the Structural and Electrical Properties of Sputtered YBCO Coated Conductors

“…Compared to alternative technologies for highly textured templates, for example, ion-beam-assisted deposition (IBAD) [2] or inclined substrate deposition (ISD) [3], the Rolling Assisted Biaxially Textured Substrate (RABiTS) [4] approach appears to be attractive for scaling up coated conductors due to available long-length substrates, easily controlled buffer growth and the potential for using cost-effective processing techniques [5]. For high quality superconductive films on metal tapes, buffer layer(s) is needed to stop atom diffusion between the tape and superconductor.…”

Spray pyrolysis of MgO templates on Hastelloy C276 and 310-austenitic stainless steel substrates for Y Ba2Cu3O7(YBCO) deposition by pulsed laser deposition

“…There is no clear explanation of the processes occurring during spray pyrolysis deposition; however, four modes, for the deposition and decomposition processes, may be distinguished and these have been studied elsewhere [35,38]. Moreover, biaxially textured MgO can be grown on non-textured metallic tapes by the inclined substrate deposition (ISD) technique [39,40] using ebeam evaporation [41][42][43][44] for the fabrication of coated superconductor wires [45].…”