北京大学学报（自然科学版）

MgB2制备过程中退火效应和热稳定性的实验研究

张撷秋1,任国利,聂瑞娟,王守证,王福仁   

  • 收稿日期:2004-04-30 出版日期:2005-09-20 发布日期:2005-09-20

The Annealing Effects of MgB2 and Experimental Study on Thermostability of MgB2

ZHANG Xieqiu1, REN Guoli, NIE Ruijuan, WANG Shouzheng, WANG Furen   

  • Received:2004-04-30 Online:2005-09-20 Published:2005-09-20

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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 MgB2 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。

关键词: MgB2相, 热稳定性, 超导薄膜

Abstract: 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 1000℃ 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.

Key words: MgB2 phase, thermostability, superconducting film

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