Synthesis and investigation of superconducting properties of heterosubstituted magnesium diboridesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The properties of magnesium diborides with the composition Mg(1 - x) M (x) B(2), where M = Al, Ga, In, and Tl, and Mg (B(1 - x) E (x) ), where E = N, P, and Si (0.05 a parts per thousand currency sign x a parts per thousand currency sign 0.3), made by sintering of calculated amounts of boron, magnesium, and a substituent element or by a solid-phase exchange reaction of a corresponding halogenide of a metal with MgB(2) at 1070-1170 K are studied. Using RFA technique, it is shown that, from all employed heterosubstituents, only the atoms of aluminum, gallium, and silicon in the amount x a parts per thousand currency sign 0.2 are incorporated into magnesium and boron sublatticies. Here, the temperature of the superconducting transition T (c) = 39 +/- 1K determined for pure magnesium diboride hardly changes.