Further Representatives of the Type RE3[Si5N9O] (RE = Dy–Er, Yb)

Abstract

The isotypic series of the oxonitridosilicates RE3[Si5N9O] (RE = Dy–Er, Yb) was synthesized via solid‐state reactions at high temperatures using a radio‐frequency furnace. The crystal structures were solved and refined from single‐crystal X‐ray diffraction and powder X‐ray diffraction data. Further characterizations were performed using vibrational spectroscopy (IR and Raman), REM‐EDX measurements, lattice energy calculations (MAPLE), charge distribution (CHARDI), and bond‐valence sum calculations (BVS). The compounds RE3[Si5N9O] (RE = Dy–Er, Yb) crystallize in the orthorhombic space group Pbcm (no. 57) (Z = 4) with the following lattice parameters: Dy3[Si5N9O]: a = 4.9865(3), b = 16.1633(9), and c = 10.6651(6) Å; Ho3[Si5N9O]: a = 4.9758(3), b = 16.1332(7), and c = 10.6312(5) Å; Er3[Si5N9O]: a = 4.9682(2), b = 16.1029(5), and c = 10.5995(3) Å; Yb3[Si5N9O]: a = 4.9473(2), b = 16.0622(5), and c = 10.5431(4) Å. The four isotypic compounds consist of a network of corner sharing SiN4 and SiN3O tetrahedra. N[2] and N[3] interconnecting nitrogen atoms build five‐membered rings, hosting the rare earth cations.