Rapid Synthesis of YBCO Thick Superconducting Films by Low Fluorine TFA-MOD Method

Abstract

To elevate the productivity of high critical current YBCO superconducting films by TFA-MOD processing,traditional trifluoroacetate(TFA)was replaced by acrylic acetate partially.Since the fluorine content in precursor solution was decreased,the ramping rate in decomposition process reached 300℃/h.Meanwhile the atmosphere was also adjusted to avoid the fatal effect of diethanolamine(DEA),and to increase thickness of YBCO film.By increasing the maximum of DEA addition to 0.75g/5mL,the thickness of film reaches 1μm.While some a-axis grains dispersed on the film surface are probably ascribed to the rise of thickness,the YBCO film has good interior microstructures overall.As a result,the highest critical current density is 3.5MA/cm2 and the critical temperature is 90K as well.