Ultrafine nanocrystal precursor induced Jc increase of YBa2Cu3O7−x films prepared using advanced low-fluorine solution
Ultrafine nanocrystal precursor induced Jc increase of YBa2Cu3O7−x films prepared using advanced low-fluorine solution
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DOI：
10.1016/j.jallcom.2013.04.160
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发表时间：
2013-11
影响因子：
6.2
通讯作者：
Yuanqing Chen;Fangyuan Yan;C. You;Gaoyang Zhao;Y. Jiao
中科院分区：
文献类型：
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作者：
Yuanqing Chen;Fangyuan Yan;C. You;Gaoyang Zhao;Y. Jiao
使用先进的低氟溶液，以 Y-TFA 和无氟 Ba 盐和 Cu 盐作为前驱体，在 LaAlO3(LAO) 基底上获得高性能 YBa2Cu3O7−x(YBCO) 薄膜。采用快速热解法，以 5 °C/min 的加热速率从 200 °C 加热至 310 °C，获得无大孔的前体薄膜。在前体膜中，形成CuO和Ba1-xYxF2+x(BYF)作为中间相。超细纳米晶 CuO 颗粒嵌入结晶 BYF 基体中，从而形成高质量的 YBCO 薄膜。与由较大 CuO 颗粒组成的前驱体制备的 YBCO 薄膜相比，所获得的单涂层 YBCO 薄膜表现出更好的面内和面外织构，以及更高的临界电流密度（77 K、0T 下超过 8 MA/cm2）。
High-performance YBa2Cu3O7−x(YBCO) films were obtained on LaAlO3(LAO) substrate using an advanced low-fluorine solution with Y-TFA and fluorine-free Ba and Cu salts as precursors. Macropore-free precursor films were obtained using a rapid pyrolysis with the heating rate of 5 °C/min from 200 °C to 310 °C. In the precursor film, CuO and Ba1−xYxF2+x(BYF) were formed as intermediate phases. Ultrafine nanocrystalline CuO particles were found embedded inside the crystalline BYF matrix, leading to the formation of high-quality YBCO film. The obtained single-coated YBCO films showed a better in-plane and out-of-plane texture, and a higher critical current density (over 8 MA/cm2at 77 K, 0T), compared with the YBCO films produced from precursor consisting of larger CuO particles.