In this paper, we reported the structural properties and superconductivity of Mg(B1-xCx)2 compounds. Powder x-ray diffraction results indicate that the samples crystallize in a hexagonal AlB2-type structure. Due to the chemical activity of Mg powders, a small amount of MgO impurity phase was detected by x-ray diffraction. The lattice parameters decrease slightly with increasing carbon content. Magnetization measurements indicate the non-stoichiometry of MgB2 has no influence on the superconducting transition temperature and the transition temperature width. The addition of carbon results in a decrease of Tc and an increase in the superconducting transition width, implying the loss of superconductivity.
@article{arxiv.cond-mat/0103203,
title = {Structure and superconductivity of Mg(B1-xCx)2 compounds},
author = {Shao-ying Zhang and Jian Zhang and Tong-yun Zhao and Chuan-bing Rong and Bao-gen Shen and Zhao-hua Cheng},
journal= {arXiv preprint arXiv:cond-mat/0103203},
year = {2009}
}
Comments
PDF files, 5 pages,3 figures, Accepted by Chinese Physics on Feb. 26, 2001(in press)