烧结温度对Y_2Ba_4CuNbO_x粉体物相成分及显微结构的影响  

Effect of sintering temperature on phase composition and microstructure of Y_2Ba_4CuNbO_x powder

作　　者：唐耀龙[1] 杨万民[1] 李国政[1] 朱维君[1] 樊静[1] 程晓芳[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2009年第5期28-31,共4页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家863基金计划资助项目(2007AA03Z241);国家自然科学基金资助项目(50872079);陕西省自然科学基金资助项目(2005E117)

摘　　要：采用固相烧结工艺，制备了Y2Ba4CuNbOx粉体．用热分析技术研究了Y2Ba4CuNbOx先驱混合物的物相成分及相变过程．结果表明，该粉体在820、950、970、1020、1100℃附近出现5个吸热峰，分别对应5种化合物产生的相变温度；不同烧结温度（1110-1150℃）下制成Y2Ba4CuNbOx样品，利用X射线衍射技术分析了其相结构，发现烧结温度在1150℃时，晶体衍射峰单一性最好，为Y2Ba4CuNbOx（2411）相；通过环境扫描电子显微镜观察和分析了Y2Ba4CuNbOx粉体的颗粒尺寸及碳含量，确定了该类粉体的合成温度为1150℃．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 10022, 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℃.

关 键 词：热分析 物相成分 烧结温度 碳含量 

分 类 号：O511.3[一般工业技术—材料科学与工程]