Eine neue Verbindung im System Ba/Ln/Zn/Pt/O: Ba4Sm4Zn3PtO15/On a New Com pound in the System Ba/Ln/Zn/Pt/O : Ba4Sm4Zn3PtO15

Abstract

Abstract Reactions of mixtures of BaCO3, ZnO, Sm2O3 (3:5:1) heated in platinum crucibles up to 1250 °C led to big black single crystals of Ba4Sm4Zn3PtO15. The new compound crystallizes with hexagonal symmetry, space group C6v 4mc, a = 11.657, c = 6,789 Å , Z = 2. It is isotypic with Ba6Nd2Al4O15 but shows an ordered Pt4+ and Zn2+ distribution over the aluminium positions. The octahedrally coordinated barium sites of the Ba6Nd2Al4O15 type are occupied by Sm3+. In comparison to compounds of the composition Ba6Ln2M4O15 (M = Al, Fe, Co), Ba4Sm4Zn3PtO15 is the first example containing different oxidation states at the M3+ positions.