Crystals, Volume 9, Issue 4 (April 2019) – 44 articles
Cover Story (view full-size image): Lanthanum’s d-electrons are more delicious than gallium’s p-electrons! Zintl phases may be oxidized by reaction with gaseous hydrogen, thereby forming hydrides. LaGa2 in the AlB2 type intercalates hydrogen atoms into La3Ga2 interstitials, which leads to the formation of a superstructure, reduction of La-d contribution at the Fermi level, and the opening of a small bandgap. Hydrogen thus prefers ‘eating up’ lanthanum’s d-electrons instead of reacting with the gallium polyanion like alkaline earth analogues AeGa2 do, which form covalent Ga–H bonds. View this paper
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