Abstract
Single crystals of BaLn 2Te 4 (Ln=Gd–Tm, Y) form as black needles from the stoichiometric reaction BaTe+2Ln+3Te at 1000°C. BaSm 2Te 4 forms as a by-product in the reaction BaTe+Sm+Zn+Te at 850°C with the aid of a BaBr 2/KBr flux. The compounds crystallize with four formula units in the space group D 2 h 16– Pnma (No. 62) in the CaFe 2O 4 (calcium ferrite) structure type. Unit cell constants range from a=13.6883(10) Å, b=4.5148(3) Å, and c=16.3427(12) Å in the Sm compound to a=13.5677(10) Å, b=4.4058(3) Å, and c=15.9989(12) Å for Tm ( t=−120°C). Ln atoms are coordinated by six Te atoms in an octahedral arrangement. These octahedra share corners and edges to form a three-dimensional channel structure. Ba atoms occupy the bicapped trigonal-prismatic sites within these channels. Magnetic susceptibility data for two representative compounds (Ln=Er and Tb) show paramagnetic behavior in the region 5–300 K.
Highlights
The family comprises a variety of similar structure types with the majority of compounds adopting the Yb3S4, MnY2S4, Th3P4, or CaFe2O4 structures
In addition to the reaction temperature, the sizes of the M21 and Ln31 cations and Q22 anion determine the structure type adopted by a given compound
The reactions proceeded in good yield, from 40% to 100% of crystals and powder; binary rare-earth tellurides were the major impurities
Summary
The family of compounds MLn2Q4 (M5divalent cation; Ln5La–Lu, Y; Q5O, S, Se) has been discussed in detail in the literature [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. The behavior of the telluride analogues is virtually unknown, as only a few compounds have been reported [7]. To this end, the compounds BaLn2Te4 (Ln5Sm–Tm, Y) have been synthesized and structurally characterized. The magnetic properties of two representative compounds have been studied
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