2018/11/06 by Hagen Poddig, Tom Donath, Paul Gebauer +5
Chemistry · Materials Science · Physics and Astronomy · #Crystal Structures and Properties #Inorganic Chemistry and Materials #Rare-earth and actinide compounds
paper · doi:10.1002/zaac.201800382
openalex publication_date 2018/11/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
Single crystals of the polytellurides RE Te 1.8 of gadolinium, terbium, and dysprosium were prepared by chemical vapor transport and alkali metal halide flux reactions. To determine proper synthesis conditions for the desired target composition, the binary phase diagram Gd‐Te was evaluated by CalPhaD methods. The compounds are isostructural to SmTe 1.8 and crystallize in space group P 4/ n (no. 85) with lattice parameters of a = 966.10(4), 960.00(3), and 957.33(2) pm and c = 1794.15(10), 1785.77(6), and 1779.38(5) pm for GdTe 1.8 , TbTe 1.8 and DyTe 1.8 , respectively. The structures consist of puckered [ RE Te] double slabs and planar telluride layers composed of Te 2 dumbbells and linear Te 3 units in accordance with ELI‐D based bonding analyses. The latter can be understood as a Te 3 4– anion. GdTe 1.8 is a semiconductor with a bandgap of 0.19 eV/0.17 eV (experimental/calculated). Magnetization data confirm trivalent RE ions and indicate antiferromagnetic order at T N = 12 K for TbTe 1.8 and T N = 9.8 K for DyTe 1.8 , whereas GdTe 1.8 remains paramagnetic down to 2 K.