Add time:07/30/2019         Source:sciencedirect.com

Ta2Te3 was prepared by reducing TaTe2 with tantalum at 1350 K in a sealed molybdenum crucible. Ta2Te3 disproportionates above 1420 K yielding the ditelluride and as yet unknown Ta6Te5. The stability limit for the substitutional sesquitellurides NbxTa2−xTe3 is reached at x ≈ 1 . The novel layered-type structure of Ta2Te3 (C 2/m, N=4; a=2049.5(3) pm, b=349.96(4) pm, c=1223.7(2) pm, β=143.74(1)0 (Guinier), N(I0)=762 with I0>2σ(I0), 32 variables, R=0.032) can be considered a stuffed variant of a molybdenite structure type. It consists of corrugated layers ∞2(Te-Ta43-Te) which, according to the shortest interlayer contacts TeTe (372.9 pm), order via van der Waals interactions. Extended homonuclear bonding regions (297.1 pm ≤ dTaTa≤ 309.7 pm) within the metal layers contribute to the stability of the metallic sesquitelluride.

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