Thermoelectric properties of Bi2Te3 material obtained by the ultrarapid quenching process route

Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons

“…In these prior investigations, the melt-spinning technique was shown to produce homogeneous ribbons with identical electrical properties although the intrinsic properties of the carriers (concentration and mobility) are different from those of the bulk SPS samples. The excellent reproducibility of the transport properties in Bi 0.48 Sb 1.52 Te 3 ribbons observed herein thus confirms the conclusions drawn for analogous compounds [43][44][45][46][47][48][49]60]. Finally, it should be kept in mind that the electronic properties of mixed crystals based on Sb 2 Te 3 -Bi 2 Te 3 are governed by native defects, the influence of which outweighs the role of differences in the microstructure of the samples.…”

“…Because melt-spun ribbons are subsequently consolidated to obtain bulk dense specimens, a detailed investigation of their microstructure-properties relationships is essential to better understand the influence of the MS process on the thermoelectric properties of Bi 2 Te 3 -based materials. In this context, Koukharenko et al investigated the microstructure and transport properties of ribbons obtained from Bi 2 Te 3 and from the Bi 2−x Sb x Te and Bi 2−x Sb x Te 2 systems [44][45][46][47][48][49]. However, melt-spun ribbons in the ternary p-type Bi x Sb 2−x Te 3 solid solution (0.48 ≤ x ≤ 0.52) have received much less attention even though the best thermoelectric performances are achieved for these particular compositions [2].…”

Effect of solvent on the microstructures of nanostructured Bi2Te3 prepared by solvothermal synthesis

“…The figure of merit, ZT = (α 2 σ/κ)T , of the best Bi 2 Te 3 based alloys is about unit [3], where α is the Seebeck coefficient, σ and κ the electric and thermal conductivity, respectively. Many works have been done in recent years to improve the thermoelectric properties of Bi 2 Te 3 based alloys [4][5][6]. It was reported that the figure of merit of thermoelectric materials could be significantly improved if the materials were nanostructured [7], such as quantum dot superlattices [8,9] and nanowires [10,11].…”

Thermoelectric properties of gas atomized p-type Sb2Te3–25% Bi2Te3 alloys

“…It is known that the intrinsic low strength and uneven thermoelectric performance of directionally grown p-type Sb 2 Te 3 -Bi 2 Te 3 alloys can be improved with fine and homogeneous distribution of thermoelectric phases formed during rapid solidification process (RSP) [1][2][3]. The RSP is also effective for suppressing the anisotropy in the crystallographic orientation and thermoelectric performance apparently due to the unit cell consisting of a large ratio of c-axis to a-axis [4].…”