MgB_2制备过程中退火效应和热稳定性的实验研究(英文)  

The Annealing Effects of MgB_2 and Experimental Study on Thermostability of MgB_2

作　　者：张撷秋[1] 任国利[1] 聂瑞娟[1] 王守证[1] 王福仁[1] 

机构地区：[1]北京大学物理学院,人工微结构和介观物理国家重点实验室,北京100871

出　　处：《北京大学学报（自然科学版）》2005年第5期715-721,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：教育部重点资助项目(02002)

摘　　要：报道了关于MgB2超导体制备过程中的退火效应和热稳定性的实验研究。把硼片在不同的温度Mg气氛中退火不同时间得到MgB2,制备样品的测量结果显示制备MgB2的合适温度范围是700～1000℃,并且较高的制备温度下只需要相对短的退火时间内就能得到较高转变温度的样品。热稳定性实验的结果显示在没有Mg的气氛中MgB2在700℃下是稳定的,从800℃开始分解, 直到完全失去超导电性。实验还观测到利用Mg B混合物薄膜前驱代替硼片制备MgB2时,在600℃退火时样品就显示超导电性。The effects of annealing on superconducting transition and the thermostability of MgB2 have been investigated. MgB2 is fabricated on boron flakes by annealing in the magnesium atmosphere at different temperatures and period of times. The temperature range from 700 to 1 000 ℃ is appropriate to prepare MgB2 in the experiments. At higher temperature shorter time is needed to get relatively high Tc. The thermostability experiments show that after the heat treatment in the atmosphere without Mg, MgB2 is stable below 700 ℃ and begins to decompose from 800 ℃ until the complete loss of superconductivity. The lower temperature is needed to form MgB2 phase when using Mg-B film precursor instead of boron flakes.

关 键 词：MgB2相 热稳定性 超导薄膜 

分 类 号：O511[理学—低温物理]