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Search Results: Magnesium diboride superconductors

Magnesium diboride, MgB2, superconducts below a critical temperature of 39 K (−389°F). It is a simple binary compound made of two of the...


= Encyclopedia Article; = Research Update
Figure 1.Temperature-dependent properties of isotopically pure Mg11B2 and Mg10B2 sintered pellets made by diffusing magnesium vapor into 11B and 10B powders. These data show a 1.0-K shift in the critical temperature Tc, with the lighter Mg10B2 having the higher superconducting transition temperature. (a) Ratio of electrical resistance, R(T), to R(300), the resistance at 300 K (80°F). (b) Magnetic susceptibility (the ratio of magnetization M to applied magnetic field H). °F = (K × 1.8) -459.67.
Figure 2.Temperature-dependent resistivity of a dense MgB2 wire segment. The inset shows the resistivity for temperatures near Tc. °F = (K × 1.8) - 459.67.
Figure 3.Superconducting upper critical field, Hc2 (T), for high-purity MgB2. The upper critical field is anisotropic, and the curves Hc2min and Hc2max represent Hc2 for grains that have the magnetic field aligned parallel and perpendicular to the crystallographic c axis, respectively.
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