Eu₂Si₅N₈ and EuYbSi₄N₇. The First Nitridosilicates with a Divalent Rare Earth Metal

The crystal structures of dieuropium penta siliconoctanitride, Eu₂Si₅N₈, and europium ytterbium tetrasiliconheptanitride, EuYbSi₄N₇, are based on three-dimensional networks of corner-sharing SiN₄ tetrahedra. Eu₂Si₅N₈ is isotypic with the previously reported Sr and Ba analogues; EuYbSi₄N₇ is isotypic with SrYbSi₄N₇ and BaYbSi₄N₇.

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