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Reference.org
Magnesium diboride
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<p>Magnesium diboride is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> of <a href="/facts/Magnesium/XyIhd2FG">magnesium</a> and <a href="/facts/Boron/Pmwgd7Mf">boron</a> with the formula MgB2. It is a dark gray, water-insoluble solid. The compound has attracted attention because it becomes <a href="/facts/Superconductor/pqQAlSzJ">superconducting</a> at 39 K (−234 °C). In terms of its composition, MgB2 differs strikingly from most low-temperature superconductors, which feature mainly transition metals. Its superconducting mechanism is primarily described by <a href="/facts/BCS_theory/KmlyhxPS">BCS theory</a>. </p>