Intermediate Phase Evolution in YBCO Superconducting Film Fabricated by Fluorine Free MOD Method

doi:10.15541/jim20170389

Abstract

Abstract:

The second generation of high temperature superconducting tape is considered to be a promising material for future power and magnet applications. Among the fabrication processes, Fluorine Free-Metal Organic Deposition (FF-MOD) method has received much attention in recent years because of its low equipment requirements, high crystal growth rate, and environmental friendliness. In present study, yttrium barium copper oxide (YBCO) films were prepared on the LAO single crystals and CeO₂/IBAD-MgO/Y₂O₃/Al₂O₃/Hastelloy C276 technical substrates by the FF-MOD technique. The samples were quenched at different temperatures and then characterized by X-ray diffraction, scanning electron microscope and ATR-FT-IR to inveitigate the phase evolution process of YBCO and BaCO₃. The results demonstrate that YBCO crystal does not formed directly by reaction between BaCO₃ and Y/Cu oxides. And the formed YBCO crystals are randomly oriented at first, and then gradually convert into the biaxially textured structure during the heat treatment process at about 800℃.

Key words: 2G-HTS, YBCO, FF-MOD, phase evolution

CLC Number:

TQ174

ZUO Jun-Liang, ZHAO Yue, WU Wei, CHU Jing-Yuan, ZHANG Zhi-Wei, HONG Zhi-Yong, JIN Zhi-Jian. Intermediate Phase Evolution in YBCO Superconducting Film Fabricated by Fluorine Free MOD Method[J]. Journal of Inorganic Materials, 2018, 33(7): 773-778.

Figures/Tables 6

Fig. 1 Diagram of temperature-atmosphere in heat treatment process

Fig. 2 XRD patterns and SEM images of samples on LAO substrate quenched at different temperatures (a) 600℃; (b) 680℃; (c) 720℃; (d) 780℃; (e) 810℃

Fig. 3 XRD patterns and SEM images on samples quenched at different temperatures on technical substrate(a) 640℃; (b) 660℃; (c) 680℃; (d) 720℃; (e) 760℃; (f) 800℃

Fig. 4 Infrared absorption spectra on samples quenched at different temperatures on artificial substrate

Fig. 5 SEM image on sample prepared on technical substrate

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