| Popis: |
The Sr 6 Nb 4 ZrO 18 niobatozirconate has been synthesized from the Sr 5 Nb 4 O 15 four-layer perovskite and the SrZrO 3 perovskite at T = 1670 K by ceramic technique. Crystal structure of the Sr 6 Nb 4 ZrO 18 compound has been studied by the X-ray powder diffraction method. It was shown that crystal structure of the Sr 6 Nb 4 ZrO 18 ( a = 0.5687(1) nm, c = 4.146(1) nm, R-3m space group) belongs to the Ba 6 Nb 4 TiO 18 -type with five-layer perovskite-like structure. The crystal structure features of the Sr 6 Nb 4 B IV O 18 compounds ( B IV = Ti, Sn, Zr) has been analyzed. The correlation between composition and crystal structure features for all Sr 6 Nb 4 B IV O 18 ( B IV = Ti, Sn, Zr) compounds, which leads to destruction slab perovskite-like structure has been revealed. |
