On the existence of solid solutions based on magnesium diborideстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Dense samples of pure magnesium boride and of the compositions Mg((1-x))A(x)B(2) (A = Na, K, Ca, Sr, Ba, Sn, Ti; 0.05 < x < 0.15) were prepared by sintering and using high temperature-high pressure treatment. The lattice parameters of most of the doped MgB2 samples vary only slightly as compared to those of the pure MgB2 irrespective of the sample preparation procedure, high temperature-high pressure treatment conditions, and the amount of dopant, thus indicating the absence of extended solid solution regions. The superconducting transition temperatures of all the samples did not exceed the value characteristic of MgB2 (39 +/- 1 K). The results obtained for the dense MgB2 samples using the Andreev reflection and tunneling spectroscopies confirm the two-gap nature of superconductivity in magnesium diboride and point to analogy between the superconductivity mechanisms in this compound and in cuprates.