Unique Periodic Modulations in the Infinite [Tex]n−Chains of RbUSb0.33Te6

Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

“…Tl 2 Te 3 comprises one‐dimensional zigzag chains 1 ∞ [Te 3 2– ] consisting of linear Te 3 units with Te–Te distances of 302 pm linked via short Te–Te contacts of 283 pm . For RbUSb 0.33 Te 6 the tellurium substructure was reported to comprise V‐shaped Te 5 6– anions, which can be interpreted as two linear Te 3 4– units linked by one common Te atom , . The distances of these nearly linear Te 3 units are in good agreement with the distances we found for the Te 3 unit in our RE Te 1.8 compounds.…”

“…Te 3 4– would be isoelectronic to a symmetric triiodide I 3 – and XeF 2 and to its smaller homologue Se 3 4– , which was described by 3c‐4e bonds within the framework of MO theory , . Linear Te 3 units were, however, found as parts of larger polychalcogenide frameworks, like in [Zn(NH 3 ) 4 ] 2 Te 15 with a Te 15 4– anion, A 2 SnTe 5 ( A = K, Rb),, Ba 2 SnTe 5 , Tl 2 Te 3 , or RbUSb 0.33 Te 6 . In K 2 SnTe 5 two linear Te 3 units form a cross shaped, slightly distorted square planar [TeTe 4 6– ] anion with Te–Te distances of 301(1) to 305(1) pm .…”

New Quaternary Barium Copper/Silver Selenostannates: Different Coordination Spheres, Metal−Metal Interactions, and Physical Properties

“…The Seebeck coefficient of BaAg 2 SnSe 4 was determined to be 550 μV/K at room temperature, i.e., about the same value found in Ba 2 SnTe 5 (560 μV/K) . That the undoped material exhibits p-type conductivity supports the trend often observed in chalcogenides. , …”

Thermoelectric properties of the new tellurides SrSc2Te4 and BaSc2Te4 in comparison to BaY2Te4

“…6). The positive sign stems from a dominance of p-type charge carriers, a typical observation in tellurides [24,30,31]. The absolute values at 300 K are 415 mV/K for SrSc 2 Te 4 , 270 mV/K for BaSc 2 Te 4 , and 120 mV/K for BaY 2 Te 4 .…”