Spray pyrolysis of epitaxial YBCO films on (100) single crystal SrTiO₃substrates

Abstract

Biaxially textured films of YBa 2 Cu 3 O 7−∂ have been deposited in situ on (100) single crystal SrTiO 3 substrates by a one step spray pyrolysis process. Good out-of-plane (FWHM = 0.4 • ) and in-plane (FWHM = 8 • ) textures have been achieved for films grown at temperatures between 800 • C and 900 • C, at atmospheric pressure. The ac susceptibility measurements have shown that the films have T c onsets of 90 K without the need of a subsequent oxygenation procedure. Magneto-optic imaging studies have indicated that the films are homogeneous, well connected and crack free. Calculations from magnetization hysteresis loops have shown that the films can have J c values as high as 1.9 × 10 5 A cm −2 at 77 K in zero field.

Spray pyrolysis for highTcsuperconductors films

“…They showed that strong texturation was possible on textured silver; this was further confirmed by Schindl et al [22]. At the same time, Shields et al [23] showed similar results on STO. The best results obtained to date was by Ferreri et al [24] who reached J c = 5 × 10 5 A cm −2 (at 77 K measured by screening current probed by Hall imaging) after using a slightly more concentrated solution than reported in their previous paper [20].…”

Development of YBa2Cu3O7−xsuperconducting films on (100) SrTiO3and (110) Ag substrates by chemical spray pyrolysis

“…This frequency produces droplet sizes of 2-3 μm. 22 The aerosol was sprayed with an argon transport flow (70-250 l h −1 ) onto the substrate heated at 850-915 °C. The deposition time varied from 1 min to 1 h. After deposition, an in situ annealing was made at the same temperature for various times (0, 15, 30, 60, 120, 240, 480 minutes).…”

“…This result was confirmed by our measurements and by other research groups. 22 Several works [22][23][24][25][26] on various types of substrates have shown that biaxially textured YBCO thick films can be spray deposited in situ at high temperature (850-920 °C) without requiring an ex situ post-annealing step. The critical current densities in the films deposited in this method mostly exceed 10 5 A cm −2 .…”

Low temperature synthesis by spray pyrolysis of La0.9Sr0.1Co0.2Fe0.8O3 thin films using ethanol and water as a solvent and their microstructural characterization

“…Several physical and chemical processes have been used to prepare the thin films, including pulsed laser ablation [10], molecular beam epitaxy [11,12], sol-gel [13,14], spin coating [15,16] and spray pyrolysis [17][18][19][20][21][22]. Among them, the spray pyrolysis technique was chosen because it has a number of advantages.…”