以无定形碳粉末作为掺杂物质,通过固相烧结的方法,在750℃,高纯氩气保护下,热处理2 h制备了MgB2-xCx(x=0,0.05,0.10,0.20,0.30)超导块材.用X射线衍射(XRD)仪,扫描电子显微镜(SEM)和物性测试仪(PPMS)对样品的微观结构和超导电性进行了系统分析.结果显示,在750℃热处理条件下,有部分碳进入MgB2的晶格中,其余碳处于MgB2的晶界处.少量碳掺杂可以有效细化MgB2晶粒,并改善MgB2的超导电性.MgB1.9C0.1块材的临界电流密度(Jc)在20 K,3 T条件下达到8×104A/cm2,表明无定形碳掺杂可有效提高MgB2的磁通钉扎.
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