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Poesl, Christine; Schnick, Wolfgang (2016): Ca2Mg5GeN6 - A Layered Nitridomagnesogermanate. In: Zeitschrift für Anorganische und Allgemeine Chemie, Vol. 642, No. 16: pp. 882-886
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Abstract

The nitridomagnesogermanate Ca2Mg5GeN6 was synthesized at 780 degrees C using a sodium flux in sealed tantalum ampules. Pure metals were used as starting materials and sodium azide NaN3 was added as nitrogen source. Ca2Mg5GeN6 was obtained as a byproduct in the form of colorless platelet-like crystals. Solution and refinement of the crystal structure [space group P6(3)/mmc (no. 194), Z = 1, a = 3.453(2), c = 17.506(13) angstrom and V = 180.8(2) angstrom(3)] were performed on the basis of single-crystal X-ray diffraction data. Ca2Mg5GeN6 represents the first layered nitridogermanate. Its structure is made up of corner-sharing (Mg/Ge)N-4 tetrahedra and corner-sharing trigonal planar (Mg/Ge)N-3 units with mixed occupancy of Mg and Ge. Ca2+ ions are located in between the sheets. The crystal structure is closely related to that of the nitridomagnesoaluminate CaMg2AlN3 as well as to the carbides ScAl3C3 and UAl3C3.