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在用YBa_2Cu_3O_z(YBCO)种膜液相外延生长Nd~(1+)xBa_)2-x_CuO_z(NdBCO)厚膜的过程中,YBCO晶体在高于熔点的温度下保持不熔化并且起到了外延种子的作用.采用高温金相显微镜,我们实时观察YBCO薄膜的熔化过程,发现了超导氧化物薄膜的过热现象,并且结合XRD极图的分析和Ba-Cu-O熔体的不润湿性现象合理解释了YBCO形成过热的机制.另外,通过对具有不同微观结构的YBCO薄膜熔化行为的横向比较,研究YBCO薄膜品质对于其过热度的影响,并用半共格界面能理论很好地解释了AFM和XRD分析及实时观察熔化过程的实验结果.
During the epitaxial growth of the Nd ~ (1+) xBa_) 2-x_CuO_z (NdBCO) thick films by liquid phase epitaxy with YBa_2Cu_3O_z (YBCO), the YBCO crystals remain unmelted at temperatures above the melting point and function as epitaxial seeds The effect of YBCO thin film melting process was observed in real time.It was found that the superconducting oxide film was overheated and the combination of the XRD pattern and the non-wettability of Ba-Cu-O melt were reasonable The mechanism of YBCO overheating is explained.Furthermore, by comparing the melting behavior of YBCO films with different microstructures, the influence of YBCO film quality on the degree of superheat is studied, and the semi-coherent interfacial theory is used to explain the effects of AFM and XRD Analysis and Real-time Observation of Melting Process Experimental Results.