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Single crystals of Ba 13 Dy 8 Zn 4 Pt 4 O 37  have been prepared by reaction of mixtures of BaCO 3 , ZnO and DyO 3  at temperatures up to 1225 °C using platinum crucibles. X-ray investigations led to a new crystal structure with tetragonal symmetry, space group C 4h  5 -I4/m, a = 18.659(7), c = 5.734(2) Å, Z = 2. The structure is characterized by PtO 6  and BaO 6  octahedra as well as by tetragonal ZnO 5  pyramids and single capped trigonal prisms of oxygen around dysprosium. The remaining barium positions show coordination numbers of nine and ten. The crystal structure has large  ∞  1 [(PtDy 4 O) 6 ) 4 ] polyhedra tunnels. Considering the  ∞  1 [Ln 4 O 16 ] 20-  polyhedra groups some parts of the structure show similarities to BaZnLn 2 O 5 , Ba 5 Zn 4 Ln 8 O 21  and Ba 2 Ln 2 ZnPtO 8 .

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Geschlossene  1  ∞ [(PtDy 4 O 16 ) 4 ]-Polyedertunnel in Ba 13 Dy 8 Zn 4 Pt 4 O 37  Closed  1  ∞  [(PtDy 4 O 16 ) 4 ] Polyhedra Tunnels in Ba 13 Dy 8 Zn 4 Pt 4 O 37