硅酸盐学报

二硼化镁超导晶体的制备与形貌表征

单位：1. 烟台大学环境与材料工程学院山东烟台 264005 2. 烟建集团有限公司山东烟台 264000

关键词：二硼化镁超导体晶体生长助熔剂法微结构

分类号：O782

出版年,卷(期):页码：2012,40(6):894-898

DOI：

摘要：

摘要：利用镁助熔剂法制备出六方片状的二硼化镁(MgB₂)单晶，并通过扫描电子显微镜和金相显微镜对MgB₂晶体形貌进行了研究。结果发现，()、(101)和(011)晶面的生长速率远远大于()、(100)和(010)晶面生长速率，即晶体沿a或b轴的生长速率明显很大，而沿c轴的生长速率很小，甚至随着晶体生长并未发生变化。在MgB₂单晶中首次观察到{0001}晶面层的解理与石墨相似，对MgB₂单晶的生长机制进行了讨论

Abstract: Hexagonal plate single crystals of magnesium diboride (MgB₂) were prepared by a Mg-flux method. The morphology of MgB₂ crystals was investigated by scanning electron microscope and metallographic microscope. The growth rates of (), (101) and (011) crystal facets were much faster than those of (), (100) and (010) facets. The crystal growth velocity along a- or b-axes was greater, and the growth velocity along c-axe was lower or unchangeable. The cleavage along {0001} crystal plane layer direction was found, which was similar to graphite. A possible growth mechanism of MgB₂ single crystals was discussed.

基金项目：

国家自然科学基金(50802081，51101133，51101134)；山东省优秀中青年科学家奖励基金(2006BS04019)资助项目

作者简介：

第一作者：杜伟(1976—)，男，副教授

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