Black single crystals of the Ba7UM2S12.5O0.5 (M = Ti, Si/Fe) compounds were obtained by standard solid-state chemistry method at 1123 K. Both compounds crystallize at 100 K in the Ba7UV2S12.5O0.5 structure type in space group I4/mcm of the tetragonal system with a = 16.1451(3) Å and c = 9.5310(2) Å (Ba7UTi2S12.5O0.5) and a = 16.1218(16) Å and c = 9.4103(11) Å (Ba7USi1.7Fe0.3S12.5O0.5). The crystal structures consist of infinite chains of U atoms octahedrally coordinated through the sharing of O/S corners along the c axis. The M atoms form isolated MS4 tetrahedra aligned also along the c axis. The space between US5O and MS4 polyhedra is filled by Ba atoms. © 2019 Elsevier B.V.

Jai Prakash

Department of Chemistry

A. Mesbah

J.C. Beard

C.D. Malliakas

J.A. Ibers

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Materials Letters

Syntheses and crystal structures of the Ba7UM2S12.5O0.5 (M = Ti, Si/Fe) compounds

Journal	Data powered by TypesetMaterials Letters
Publisher	Data powered by TypesetElsevier B.V.
ISSN	0167577X