α-SrZn5-Type solid solution, BaZn2.6Cu2.4

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    Abstract

    Single crystals of the title compound barium zinc copper, BaCu2.6Zn2.4, were obtained from a sample prepared by heating metal chips of Ba, Cu, and Zn in an Ar atmosphere up to 973K, followed by slow cooling. Single-crystal X-ray structure analysis revealed that BaCu2.6Zn2.4 crystallizes in an orthorhombic cell [a = 12.9858(3), b = 5.2162(1), and c = 6.6804(2)Å] with an α-SrZn5-type structure (space group Pnma). The three-dimensional framework consists of Cu and Zn atoms, with Ba atoms in the tunnels extending in the b-axis direction. Although the Ba atom is larger than the Sr atom, the cell volume of BaCu2.6Zn2.4 [452.507(19)Å3] is smaller than that of α-SrZn5 [466.08Å3]. This decrease in volume can be attributed to the partial substitution of Cu atoms by Zn atoms in the framework because the Cu - Zn and Cu - Cu bonds are shorter than the Zn - Zn bond. The increase in Ba - Zn interatomic distances from the Sr - Zn distances is cancelled out by the partial replacement of Zn with Cu atoms, which leads to shorter average Ba - Zn/Cu distances.

    Original languageEnglish
    Pages (from-to)1490-1493
    Number of pages4
    JournalActa Crystallographica Section E: Crystallographic Communications
    Volume75
    DOIs
    Publication statusPublished - 2019 Oct 1

    Keywords

    • Barium zinc copper
    • Crystal structure

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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