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Pösl, Christine; Schnick, Wolfgang (2017): Ca4Mg5Ge3N10 and Sr2Mg3GaN4.33: Two Mg-Containing Nitrides and Their Structural Relation to (Sr, Ba)(2)Si5N8. In: European Journal of inorganic Chemistry, No. 11: pp. 1498-1503
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Abstract

The quaternary nitrides Ca4Mg5Ge3N10 and Sr2Mg3GaN4.33 were synthesized by employing the Na azide route in weld-shut Ta ampules. The two compounds are homotypic and crystallize in the monoclinic space group C2/m (no. 12). The crystal structures were solved and refined on the basis of single-crystal X-ray diffraction data [Ca4Mg5Ge3N10: a = 11.269(3), b = 3.3267(11), c = 8.008(3) angstrom, beta = 109.80(2)degrees, V = 282.44(16) angstrom(3), Z = 1;Sr2Mg3GaN4.33: a = 11.737(2), b = 3.4610(7), c = 7.8610(16) angstrom, beta = 108.03(3)degrees, V = 303.65(12) angstrom(3), Z = 1]. The three-periodic anionic substructures of both nitrides are made up of MN4 tetrahedra with mixed occupation of central atoms M = Mg/Ge and Mg/Ga, respectively. Corner- and edge-sharing of MN4 tetrahedra results in vierer and sechser ring channels along [010]. Alkaline earth metal ions are located within sechser ring channels. The crystal structures are also homeotypic with that of known Ca2MgGa3N5 and represent a more highly condensed variant of the (M2Si5N8)-Si-II (M-II = Sr, Ba) type of structure.