Relations between the electronic properties and the chemical bonding of sbxBi2−xTe3−ySey system

Hydrothermally synthesized and hot-pressed Bi2(Te,Se)3 thermoelectric alloys

“…It has been reported that the lattice constants decrease continuously with an increase in the Bi 2 Se 3 content in Bi 2 (Te,Se) 3 solid solutions [13,15]. In this work, the lattice constants of both a-axis and c-axis of the hot-pressed Bi 2 (Te,Se) 3 alloys, a and c, fall between Bi 2 Te 3 and Bi 2 Se 3 .…”

“…They can form continuously solid solutions Bi 2 (Te,Se) 3 which have structures similar to Bi 2 Te 3 and Bi 2 Se 3 in the whole compositional range [13,15]. The XRD pattern and the EDAX spectrum of the hydrothermally synthesized Bi 2 (Te,Se) 3 powder are showed in Figs.…”

“…In order to further improve the TE properties, ntype Bi 2 Te 3 is often alloyed with Se to form Bi 2 (Te,Se) 3 solid solutions, and doped with Iodine [12][13][14][15][16]. However, no such works related to the hydrothermal method have been reported so far.…”

Tunable Dirac cone in the topological insulator Bi2-xSbxTe3-ySey

“…In this regard, the tetradymite Bi 2-x Sb x Te 3-y Se y (BSTS) solid solution, which has the same crystal structure as Bi 2 Te 2 Se (Fig. 1a), is of interest because a series of special combinations of x and y have been known to yield a high resistivity [13][14][15] . Thus, in the insulating compositions reported here ((x, y) = (0, 1), (0.25, 1.1), (0.5, 1.3), (1, 2)), the y value is unique when x is specified (details are described in Methods (in the subsection Transport properties of BSTS)).…”

OptimizingBi2−xSbxTe3−ySeyRen1, Taskin2, Sasaki3 et al. 2011Phys. Rev. B333423776View full textAdd to dashboardCite

“…28 Except for a narrow composition region close to Sb 2 Se 3 , BSTS takes the same rhombohedral structure as its three end members Bi 2 Te 3 , Bi 2 Se 3 , and Sb 2 Te 3 , all are known to be TIs. [11][12][13][14] Hence, BSTS is naturally expected to be a TI as long as its structure is rhombohedral.…”