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超导体MgB₂的高温电阻率及热重差热分析

Study on High Temperature Resistivity and TG-DTA of New Superconductor MgB₂

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【Author】 WANG Hong tao 1,2 ,ZHANG Guo fang 2,3 ,SHEN Jing qin 2 ,LU Yi 2 ,XU Zhu an 2 (1 Department of Physics, Wenzhou Normal College, Wenzhou 325027; 2 Department of Physics, Zhejiang University, Hangzhou 310027; 3 Department of

【机构】温州师范学院物理与电子信息科学系；浙江大学理学院物理系；浙江大学理学院物理系浙江温州325027；浙江杭州310027；浙江杭州310027；河南南阳师范学院物理系；河南南阳473061；浙江杭州31002；

【摘要】利用Mg扩散法制备出单相多晶的MgB2 超导体 ,其超导转变的零电阻温度为 3 8 4K左右 ,转变宽度小于 1K。正常态电阻率温度关系为金属型 ,在 2 70K -4 5 0K的高温范围内电阻率与温度成很好的线性关系。差热和热重分析表明在空气气氛中MgB2 在 90 0℃左右开始急剧氧化。更多还原

【Abstract】 The single phase and polycrystalline MgB 2 superconductor was successfully synthesized by Mg diffusion method. Its resistive superconducting transition temperature T c≈38 4K, and the width of transition is less than 1K. The normal state temperature dependence of electtrical resistivity is mental like and it is linear in high temperature range from 270K to 450K. TG DTA analysis indicated that MgB 2 is burned quickly in air when the temperature is as high as 900℃.更多还原