Structure and properties of solid solutions in the Mg-Al-B systemстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Compounds with the general formula Mg1−xAlxB2 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−xAlxB2 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.