Rare-earth-rich tellurides: Gd4NiTe2 and Er5M2Te2 (M=Co, Ni)
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Three new rare earth metal-rich compounds, Gd 4NiTe 2, and Er 5M 2Te 2 (M=Ni, Co), were synthesized in direct reactions using R, R 3M, and R 2Te 3 (R=Gd, Er; M=Co, Ni) and single-crystal structures were determined. Gd 4NiTe 2 is orthorhombic and crystallizes in space group Pnma with four formula units per cell. Lattice parameters at 110(2) K are a=15.548(9), b=4.113(2), c=11.7521(15)Å. Er 5Ni 2Te 2 and Er 5Co 2Te 2 are isostructural and crystallize in the orthorhombic space group Cmcm with two formula units per cell. Lattice parameters at 110(2) K are a=3.934(1), b=14.811(4), c=14.709(4)Å, and a=3.898(1), b=14.920(3), c=14.889(3)Å, respectively. Metal-metal bonding correlations were analyzed using the empirical Pauling bond order concept. Slightly-off  projection of the Gd 4NiTe 2 structure, featuring Gd 6Ni 2 chains that exemplify an increasingly common structural motif in reduced ternary tellurides of the rare-earth metals. © 2004 Elsevier Inc. All rights reserved.
author list (cited authors)
Magliocchi, C., Meng, F., & Hughbanks, T
complete list of authors
Magliocchi, Carmela||Meng, Fanqin||Hughbanks, Timothy