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Single crystals of Sr 3.67 Na 0 . 33 PtO 6  were prepared by heating oxide mixtures in closed silver tubes and investigated by X-ray single crystal techniques. It crystallizes with trigonal symme­try, space group D 6  3d -R3̅c (Nr. 167) with a = 9.6617, c = 11.6580 Å, Z = 6. Sr 3.67 Na 0 . 33 PtO 6  belongs to the Sr 4 PtO 6  type and is isotypic to K 4 CdCl 6 . One point position characterized by a trigonal prismatic O 2-  coordination is occupied by Na +  and Sr 2+  statistically. The crystal structure is discussed with respect to the related compounds Sr 3 CuPtO 6  and Ca 3. 5 Cu 0.5 PtO 6 .

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Zur Kristallchemie der Oxoplatinate. Eine neue Phase der Zusammensetzung Sr 4-ϰ Na ϰ PtO 6  (ϰ = 0,33) / On the Crystal Chemistry of Oxoplatinates. A New Phase of the Composition Sr 4-ϰ Na ϰ PtO 6  (ϰ = 0,33)