中文摘要：

将Mg粉、Zr粉和B粉按比例混合获得Mg1-xZrxB2（x=5%、10%和20%）,压制成型后,在流通氩气的条件下于800℃烧结2h.利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）分析烧结后样品的显微结构和化学组成,采用差热分析（DTA）观察Zr掺杂对MgB2分解温度的影响,并用物性测试仪（PPMS）测试样品的超导电性.结果表明,适量的Zr掺杂使得MgB2的平均晶粒尺寸变小,晶界面积增加和晶粒连接性改善,获得致密性较高的MgB2超导体,其临界电流密度比较大.

英文摘要：

Mg powder,Zr powder and B powder with a ratio（Mg1-xZrxB2,x=5%、10% and 20%）were mixed and pressed into pellets.In a flow of high purity argon gas,these samples were sintered for 2h at 800℃.X-ray diffractometer and scanning electron microscopy were used to analyze the phase composition and the microstructure of the sintered MgB2 samples.We investigated the effect of Zr adopting on the decomposition temperature of MgB2 phase with differential thermal analysis.And the superconducting properties of all samples were investigated by physical property measurement system.It was revealed that,by a certain Zr doping,the decrease of the average MgB2 grain size,the increase of the area of grain boundary and the improved grain connection were responsible for the higher dense MgB2 bulks,and it has a higher critical current density.