Synthesis of Y-Ba-Cu-O films with ethylene diamine tetra-acetic acid complexes assisted by excimer laser ablation

摘要

Y-Ba-Cu-O films were prepared on yttria-stabilized zirconia polycrystalline substrate using KrF excimer laser irradiation with ethylene diamine tetra-acetic acid (EDTA) complexes as a target material. The results of the x-ray theta-2 theta scan showed that the films grown above 750 degrees C were preferentially oriented with a c-axis normal to the substrate. The value of full-width at half-maximum of (005) reflection reduced from 4.4 degrees to 2.1 degrees by increasing the laser power density in a range between 0.8 and 3.8 J/cm(2). The transcription of the compositional ratio was improved by approaching the target-substrate distance from 45 to 20 mm, The films obtained at 800 degrees C consisted of many islands showing well-developed spiral growth, suggesting that the droplets of metal-EDTA complexes do not form random oriented crystalline particles on the surface of the substrate. References: 9