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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.
Mg1-xZrxB2 (x = 5%, 10% and 20%) was obtained by mixing Mg powder, Zr powder and B powder in proportion, and then press-molded and sintered at 800 ℃ for 2h under argon gas flow. The microstructure and chemical composition of the sintered samples were analyzed by XRD and SEM. The effect of Zr doping on the decomposition temperature of MgB2 was observed by DTA. The samples were tested by physical property tester (PPMS) The results show that proper doping of Zr makes the average grain size of MgB2 smaller, the increase of grain boundary area and the improvement of grain connectivity, and the higher critical current density of MgB2 superconductor with higher density is obtained.