Abstract
AbstractThe oxonitridosilicate oxides Ln3[SiON3]O with Ln = La, Ce, Pr were obtained by high‐temperature syntheses (1450–1600 °C) in a radio‐frequency furnace. The crystal structures were determined from single‐crystal X‐ray diffraction data and confirmed by Rietveld refinements. The compounds Ln3[SiON3]O crystallize in space group I4/mcm (La3[SiON3]O: a = 6.8224(10), c = 11.074(2) Å, Z = 4; R1 = 0.0240; Ce3[SiON3]O: a = 6.7233(10), c = 11.069(2) Å, Z = 4, R1 = 0.0234; Pr3[SiON3]O: a = 6.6979(9), c = 11.005(2) Å, Z = 4; R1 = 0.0156) and they were found to be isotypic with Gd3[SiON3]O, whose structure derives from the anti‐perovskite structure type. In the crystal structure there are elongated OLn6‐octahedra, which are interconnected through common vertices. In the cavities of this network there are exclusively non‐condensed SiON3 tetrahedra. 29Si solid‐state NMR investigations, lattice energy calculations (MAPLE) and EDX measurements confirmed the crystal structure and the chemical compositions. For Ce3[SiON3]O, magnetic susceptibility measurements were carried out and the paramagnetic behavior with an experimental magnetic moment of 2.2 μB per cerium atom indicates Ce3+.
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