Abstract
AbstractThe new oxonitridosilicates Ba4−xCaxSi6N10O have been synthesized by means of high‐temperature synthesis in a radio‐frequency furnace, starting from calcium, barium, silicon diimide and amorphous silicon dioxide. The maximum reaction temperature was at about 1450 °C. The solid solution series Ba4−xCaxSi6N10O with a phase width 1.81 ≤ x ≤ 2.95 was obtained. The crystal structure of Ba1.8Ca2.2Si6N10O was determined by X‐ray single‐crystal structure determination (P213, no. 198), a = 1040.2(1) pm, Z = 4, wR2 = 0.082). It can be described as a highly condensed network of corner‐sharing SiN4 and SiON3 tetrahedra, the voids of which are occupied by the alkaline earth ions. The structure is isotypic with that of BaEu(Ba0.5Eu0.5)YbSi6N11. In the 29Si solid‐state MAS‐NMR spectrum two isotropic resonances at −50.0 and −53.6 ppm were observed.
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