Investigations Of Solid Solutions Of CsBi₄Te₆

Abstract

Results on the synthesis and characterization of the solid solutions CsBi4-xSbxTe6, CsBi4Te6-ySey, as well as doping experiments on CsBi4Te6 are reported. We report X-ray structural investigations showing that the Sb or Se atoms in these compounds are not uniformly distributed in the lattice but show preferential occupation of specific crystallographic sites. Thermoelectric properties of selected systems are presented.

Synthesis and thermoelectric properties of Zn4Sb3/Bi0.5Sb1.5Te3 bulk nanocomposites

“…Numerous researches have been performed to enhance the figure of merit, ZT = S 2 T/ (where S is the Seebeck coefficient, is the electrical resistivity, is the thermal conductivity, and T is the absolute temperature) by alloying and doping [2][3][4][5][6][7][8][9][10] since Bi 2 Te 3 -based thermoelectric materials were found in 1950s. Recent reports, however, demonstrate that low-dimensional TE materials such as p-type Bi 2 Te 3 /Sb 2 Te 3 superlattice thin films [11,12] and the nanostructured (Bi, Sb) 2 Te 3 bulk alloys [13][14][15] show a significant enhancement of their ZT mainly due to decreases of the thermal conductivity in these structures.…”

Thermoelectric properties of Bi3+ substituted Co-based misfit-layered oxides

“…Over the past several decades, a lot of thermoelectric materials including alloy semiconductors (e.g., Bi 2 Te 3 , PbTe and SiGe) have been found and applied in generation power and refrigeration. Recently, new alloys systems with high ZT have been reported, such as skutterudites (e.g., CeFe 4 Sb 12 ) [1], CsBi 4 Te 6 [2], and AgPb 18 SbTe 20 [3].…”

High-pressure preparation and thermoelectric properties of Bi0.85Sb0.15

“…4 The product of the figure of merit and temperature, ZT, at 300 K achieved so far is 1.14 for the p-type alloy (Bi 2 Te 3 ) 0.25 (Sb 2 Te 3 ) 0.72 (Sb 2 Se 3 ) 0.03 . 5 At low temperature, ZT of p-type CsBi 4 Te 6 is 0.8 at 225 K, 6 and single crystals of n-type Bi 1Àx Sb x alloys exhibit the optimum thermoelectric performance at 80 K. [7][8][9] Bi and Sb are semimetals, which both exhibit a similar rhombohedral crystal structure (the so-called A7 structure) of space group R 3m. Bi 1Àx Sb x alloys form a solid solution over the entire composition range.…”