Abstract:
In this study, the Y2Ba4CuNbOx powders is synthesized by the solid-state reaction method. First of all, study phase compositions and phase-change process of Y2Ba4CuNbOx pioneer powders are probed by thermal analysis techniques. It can be seen from the differential thermal analysis (DTA) curve, five endothermic peaks appeared near 820, 950, 970, 1 020, 1 100℃, corresponding to the generation of five new compounds separately; Then the Y2Ba4CuNbOx samples were sintered at different temperatures (1 110℃ ~ 1 150℃), then phase compositions and structure of the samples are analyzed by X-ray diffraction (XRD). It is found that when the sample was sintered at 1 150℃, the best single crystal diffraction peak is obtained, which is the 2 411 phase. Finally, the particle size and carbon content of Y2Ba4CuNbOx powders are analyzed through environmental scanning electron microscope (SEM), and the synthesis temperature of the powder is defined to be 1 150℃.
