Abstract
Compounds with the general formula Mg1−x Al x B2 were obtained by two-step ceramic synthesis. All compounds were characterized by X-ray diffraction, NMR spectroscopy, and by four point probe resistivity measurements in various magnetic fields method. The diborides unit cell parameters were determined as a function of the Al mole fraction. With the vaues of x up to 0.40 (where x is the composition of the stock prepared for sintering), the unit cell parameters of Mg1−x Al x B2 are similar to those of pure MgB2 and the superconducting transition temperature was lowered. For stock compositions of 0:25 ≤ x ≤ 0:60, the products contain a superstructure, also superconducting phase, which becomes the only product at x = 0:50, and at x > 0:60 this phase is replaced by AlB2-based solid solutions.
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Sevastyanova, L.G., Gulish, O.K., Stupnikov, V.A. et al. Structure and properties of solid solutions in the Mg-Al-B system. centr.eur.j.phys. 10, 189–196 (2012). https://doi.org/10.2478/s11534-011-0013-8
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DOI: https://doi.org/10.2478/s11534-011-0013-8