一步热处理制备氧化硼掺杂的YBCO超导膜

Preparation of Boron Oxide Doped YBCO Superconducting Films by One-step Heat Treatment

为了提高化学法制备长带YBCO的效率,传统的前驱膜多次热解过程需要被缩减为一次,热解后不经过降温直接连接YBCO的晶化过程。采用异辛酸铜替代三氟乙酸铜,可以缓解热解过程的集中放热,缓解前驱膜的收缩。适量硼酸被添加进1.0 mol/L的前驱液,经过一次连续热处理,YBCO超导膜被制备出来。利用硼酸在200至500℃的流动态这一特性,氧化硼填充进YBCO气孔,所得YBCO膜更加致密、光亮,与同样条件无掺杂前驱液制备的YBCO对比,具有更高的超导电性。

In order to improve the efficiency of chemical preparation of YBa2 Cu3 O7-δ(YBCO) with long taps, the pyrolysis of traditional process preparing precursor film needs to be reduced to one step, so the crystallization process should be directly connected to the former without the cooling of pyrolysis. Replacing copper trifluoroacetate with copper isooctanoate can alleviate the centralized heat release and the contraction of the precursor film during pyrolysis. In this study, a suitable amount of boric acid was added into the precursor solution with total cation concentration of 1.0 mol/L. After a continuous heat treatment YBCO superconducting film was obtained. Utilizing the flow state of boric acid at 200~500℃, boron oxide was doped into YBCO film which becomes denser and smoother by filling some pores. Compared with that one prepared by undoped precursor solution under the same conditions, the former shows higher superconductivity.