Sr5Al2Sb6 und Ba5In2Sb6: Zwei neue Zintlphasen mit unterschiedlichen Bänderanionen / Sr5Al2Sb6 and Ba5In2Sb6: Two New Zintl Phases with Different Chain Anions
Gerhard CordierMichael Stelter
Abstract
Abstract The compound Sr 5 Al 2 Sb 6 crystallizes in the orthorhombic system (space group Pnma (No. 62)) with the lattice constants: a = 1212.4(4) pm, b = 1034.1(4) pm, c = 1340.9(5) pm. AlSb 4 tetrahedra are connected via common edges and corners to chains. Every second terminal Sb atom of the chain is connected to another Sb atom, such that end-on Sb 2 groups and terminal Sb alternate. The compound Ba 5 In 2 Sb 6 crystallizes in the orthorhombic system (space group Pbam (No. 55)). The lattice constants are: a = 1530.7(6) pm, b = 1335.8(5) pm, c = 478.6(2) pm. In the structure, InSb 4 tetrahedra are connected via common corners and Sb 2 groups to form double chains. Both compounds are classified as Zintl phases.
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