Abstract: The structural properties and superconductivity of Mg1-xNaxB2 compounds are reported in this paper. Bulk samples X- ray diffraction (XRD) results indicate that the samples crystallize in a hexagonal structure. Due to the chemical activity of Mg powders, a sample amount of MgO impurity phase is detected by X-ray diffraction. Magnetization measurement results indicate that the non- stoichiometry of MgB2 has no influence on the superconducting transition temperature and the transition temperature width. And the introduction of Na almost has no effect on the transition temperature.

Key words: Mg1 - x NaxB2, superconductivity, XRD