Enhancement of Thermoelectric Performance in Na-Doped PbSnTeSe S via Breaking the Inversion Symmetry, Band Convergence, and Nanostructuring by Multiple Elements Doping.

Topological insulators have attracted much interest in topological states of matter featuring unusual electrical conduction behaviors. It has been recently reported that a topological crystalline insulator could exhibit a high thermoelectric performance by breaking its crystal symmetry via chemical doping. Here, we investigate the multiple effects of Na, Se, and S alloying on thermoelectric properties of a topological crystalline insulator PbSnTe.

Enhancement of Thermoelectric Performances in a Topological Crystal Insulator PbSnSe via Weak Perturbation of the Topological State and Chemical Potential Tuning by Chlorine Doping.

Topological insulators generally share commonalities with good thermoelectric (TE) materials because of their narrow band gaps and heavy constituent elements. Here, we propose that a topological crystalline insulator (TCI) could exhibit a high TE performance by breaking its crystalline symmetry and tuning the chemical potential by elemental doping. As a candidate material, we investigate the TE properties of the Cl-doped TCI PbSnSe.

Dataset on the electronic and thermal transport properties of quaternary compounds of (PbTe)(PbSe)(PbS).

The data presented in this article are related to the research article entitled "High thermoelectric performance in pseudo quaternary compounds of (PbTe) (PbSe)(PbS) by simultaneous band convergence and nano precipitation" (Ginting et al., 2017) [1]. We measured electrical and thermal transport properties such as temperature-dependent Hall carrier density , Hall mobility , thermal diffusivity , heat capacity , and power factor in (PbTe) (PbSe)(PbS) (=0.

Syntheses of 4-Indolylquinoline Derivatives via Reductive Cyclization of Indolylnitrochalcone Derivatives by Fe/HCl.

An easy and efficient procedure for the synthesis of 4-indolylquinoline derivatives is described. This process involves two steps, the first of which is the Michael addition of indole to nitrochalcones promoted by sulfamic acid under solvent free conditions and the second step is a reductive cyclization of the indolylnitrochalcone intermediates to 4-indolylquinoline derivatives by Fe/HCl in ethanol. In both steps, the reactions are clean and the yields of products are high.