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传统全三氟乙酸前驱液对涂敷环境湿度、低温预分解过程中的升温速率和水汽分压等因素具有敏感性,采用改进型前驱液可以降低其敏感性,从而有利于涂层导体的连续制备.我们提出的改进型前驱液中,三氟乙酸钇、三氟乙酸钡和苯甲酸铜是前驱体,甲醇和丙酸的为溶剂.采用化学溶液法在铝酸镧单晶衬底上制备YBCO,低温分解阶段以1～5℃/min快速升温,可以获得低温后的前驱膜光滑完整,无裂纹.通过X衍射分析和扫描电镜分析了薄膜的织构和表面微结构,四引线法测试薄膜超导电性.采用改进型前驱液制备的薄膜超导转变温度(Tc)为90K,在77K、自场下临界电流密度(Jc)为1MA/cm2.
Conventional perfluoroacetic acid precursors are sensitive to such factors as the coating environment humidity, the rate of temperature rise during the low temperature pre-decomposition and the water vapor partial pressure. The improved precursors can reduce their sensitivity and thus be conducive to the continuity of the coated conductors Preparation of the precursor solution we proposed, yttrium trifluoroacetate, barium trifluoroacetate and copper benzoate are precursors, methanol and propionic acid as a solvent prepared by chemical solution on the lanthanum aluminate single crystal substrate YBCO, rapidly heating at 1 ~ 5 ℃ / min in the low temperature decomposition stage, the precursor film after cryogenic temperature can be obtained is smooth and complete without cracks.The texture and surface microstructure of the films were analyzed by X-ray diffraction and scanning electron microscope, The superconductivity of the thin films is 90K and the critical current density (Jc) is 1MA / cm2 at 77K.