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(T_c)为90K,在77K、自场下临界电流密度(J_c)为1MA/cm~2.
Traditional all-TFA precursor solution for coated conductors has sensitivity with the humidity, water vapor pressure and heating rate in pyrolysis process, whereas modified precursor solution could lower its sensitivity and is beneficial to reel-to-reel processing. The modified precursor solution was prepared by mixing yttrium triflu-oroacetate, barium trifluoroacetate, copper benzoate, where the solvent was a mixture of methanol and propionic acid. YBCO films have been deposited on LaAlO_3 single crystal substrate by chemical solution deposition with modified precursor solution. Smooth, crack-free and homogeneous films have been obtained in rapid calcining process. The texture, microstructure and superconducting properties of films were characterized by X-ray diffraction, scanning electron microscopy and the four-probe method, respectively. The YBCO films prepared by modified precursor solution have demonstrated high performance T_c = 90K, J_c(77K, self field) =1MA/cm~2.
参考文献
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