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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Influence of doping effect on structure and superconducting properties of MgB2
XIONG Yu-hua(熊玉华)1, LI Pei-jie(李培杰)1,
ZHANG Xiao-ping(张晓平)2,ZHAO Yong-gang(赵永刚)2,
CAO Bi-song(曹必松)2, ZENG Da-ben(曾大本)<

1. Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, China
2. Department of Physics, Tsinghua University, Beijing 100084, China

Abstract:Mg1-xMxB2(M=Li or deficiency) compounds were prepared and their structure and superconducting properties were studied. The results show that nearly single-phased Mg1-xLixB2 samples have been obtained while x≤0.3. With increasingx, lattice parameters a decreases and c shows no obvious change, and the superconducting transition temperature Tc of Mg1-xLixB2 decreases. Moreover, loss of superconductivity occurs for sample with x=0.5. For Mg1-xB2 nearly single-phased samples can be obtained at x=0. MgB2 coexists with MgB4 phase and some minor impurity phases while 0<x<0.5. With the increase of x, a and c of MgB2 decreases and increases, respectively, and Tc decreases. The obvious difference in the superconductivity of Mg1-xLixB2 and Mg1-xB2 suggests that Li indeed dopes into the structure of MgB2.

 

Key words: Mg1-xLixB2; Mg1-xB2; lattice parameter; superconducting transition temperature

ISSN 1672-7029
CN 43-1423/U

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