Phase range and physical properties of the thallium tin tellurides Tl10−xSnxTe6 (x≤2.2)

Inside Cover: Configurational Assignment of Secondary Hydroxyl Groups and Methyl Branches in Polyketide Natural Products through Bioinformatic Analysis of the Ketoreductase Domain (ChemBioChem 7/2013)

“…Tl 8.33 Sn 1.12 Bi 0.55 Te 6 exhibits a rather low Seebeck coefficient, although it should be almost charge balanced with a nominal valence electron number of 68.23. This observation is in line with the fact that the Tl 9 BiTe 6 samples typically exhibit higher Seebeck values (and lower electrical conductivity)16,17 than the isoelectronic Tl 4 SnTe 3 (Tl 8 Sn 2 Te 6 ) samples 18,22…”

“…As the bismuth content and thus the number of electrons increase, so does the Seebeck coefficient. This is due to the decreasing number of p‐type carriers, which at the nominal composition Tl 9 Sn 0.2 Bi 0.8 Te 6 (67.8 v. e.) displays values of 89 μV · K –1 at room temperature and 151 μV · K –1 at 587 K. For ease of reference, the values from Tl 9 SnTe 6 (67 v. e.) from a previous study22 were included in the plot. As expected, Tl 9 SnTe 6 with the largest electron deficit has the lowest Seebeck values, showing 39 μV · K –1 at room temperature.…”

Superconducting dome and crossover to an insulating state in [Tl4]Tl1−xSnxTe3

“…There has been some question about the doping limit and location, with previous reports variously claiming the maximum possible Sn content as ranging from x = 0.8 to x = 1.1. 20,22,23 Our data clearly show a continuous evolution of lattice parameters up to x = 1.0, followed by a plateau when x > 1, demonstrating that substitution of up to one molar equivalent of Sn for Tl is possible. The limit of x = 1 is consistent with charge counting: assuming dianionic Te, the formal charges are [Tl 4 ] 4+ Tl 2+ Te 3 2− ; divalent Sn 2+ is then able to substitute for all divalent, but not monovalent, Tl, i.e., up to one molar equivalent.…”

“…This transition from metallic towards insulating behavior upon Sn doping is in agreement with previous measurements. 23 There is a concomitant change in the shape of the temperature dependence that also suggests a change in the dominant scattering mechanism across the series. Accompanying these changes in physical properties are changes in the structure.…”

Tl4SnS3, Tl4SnSe3 and Tl4SnTe3 crystals as novel IR induced optoelectronic materials

“…Particular interest present thallium chalcogenides [3,4]. Up today several thallium containing chalcogenide ternary systems were studied.…”