Abstract
Sc9Te2 was prepared by high-temperature solid-state techniques, and the structure was determined by single-crystal X-ray diffraction to be monoclinic, Cc (No. 9, Z = 8) with a = 7.7576(1) A, b = 15.654(3) A, c = 17.283(3) A, and β = 90.01(3)° at 23 °C. The structure of metallic Sc9Te2 can be viewed as columns built either from distorted 3 × 3 bcc metal atoms or from distorted edge-sharing octahedra along a that are joined via intercolumn bonds on opposite sides into two-dimensional layers along b. A corrugated layer of Te atoms separates the metal layers in the c direction. This structure derives from the Ti9Se2 structure, with doubled a and b dimensions and a lower symmetry. Magnetic susceptibility measurements on Sc9Te2 show a substantially temperature-independent paramagnetism that is much smaller per metal atom than those for other scandium-rich tellurides or scandium metal. Extended Huckel band calculations reveal a clear distinction between high overlap populations for Sc−Sc interactions in the in...
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