中国物理B ›› 2001, Vol. 10 ›› Issue (4): 335-337.doi: 10.1088/1009-1963/10/4/314
张绍英, 张健, 赵同云, 荣传兵, 沈保根, 成昭华
Zhang Shao-ying (张绍英), Zhang Jian (张健), Zhao Tong-yun (赵同云), Rong Chuan-bing (荣传兵), Shen Bao-gen (沈保根), Cheng Zhao-hua (成昭华)
摘要: In this paper, we report on 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 is detected by X-ray diffraction. The lattice parameters decrease slightly with the increasing carbon content. Magnetization measurements indicate that 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 of the superconducting transition width, implying the loss of superconductivity.
中图分类号: (Metals; alloys and binary compounds)