二硼化镁超导晶体的制备与形貌表征(英文)  

Preparation and Morphology Characterization of Magnesium Diboride Superconducting Crystals

作　　者：杜伟[1] 杜崇磊 咸绪刚[1] 赵相金[1] 刘丽[1] 王卓[1] 秦连杰[1] 徐仁根[1] 

机构地区：[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

出　　处：《硅酸盐学报》2012年第6期894-898,共5页Journal of The Chinese Ceramic Society

基　　金：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

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,(1 11)、(101)和(011)晶面的生长速率远远大于(1 10)、(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。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 （1 T1 ）, （101） and （011） crystal facets were much faster than those of （ 1-10 ）, （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.

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[理学—晶体学]