A New Thermoelectric Material: CsBi₄Te₆.

Abstract

A New Thermoelectric Material: CsBi 4 Te 6 . -The title compound is obtained in quantitative yield by reaction of Cs 2 Te and Bi 2 Te 3 at 700°C (60 h). CsBi 4 Te 6 crystallizes in the monoclinic space group C2/m with Z = 8 (single crystal XRD). The structure consists of NaCl-type [Bi4 ] layers and Cs + ions residing between the layers. The anionic layers are interconnected by Bi-Bi bonds with a distance of 3.2383 Å. CsBi 4 Te 6 is a narrow gap semiconductor. The electrical properties can be tuned by doping to yield an optimized thermoelectric material which is promising for low-temperature applications. SbI3 doping results in p-type behavior and a maximum power factor of 51.5 µW/cm·K 2 at 184 K and the corresponding thermoelectric figure of merit ZT of 0.82 at 225 K. The highest power factor of 59.8 µW/cm·K 2 at 151 K is observed for the 0.06% Sb-doped material. -(CHUNG, D.-Y.; HOGAN, T. P.; ROCCI-LANE, M.; BRAZIS, P.; IRELAND, J. R.; KANNEWURF, C. R.; BASTEA, M.; UHER, C.; KANATZIDIS*, M. G.; J. Am. Chem. Soc. 126 (2004) 20, 6414-6428; Dep. Chem., Mich. State Univ., East Lansing, MI 48824, USA; Eng.) -Schramke 33-018 Te -6

Structures and thermoelectric properties of the infinitely adaptive series(Bi2)m(Bi2Te3Bos1, Zandbergen2, Lee3 et al. 2007Phys. Rev. B188141291View full textAdd to dashboardCite

“…A large number of new materials with promising thermoelectric properties have been investigated. These include, for example, filled skutterudites, 1,2 clathrates, 3 pentatellurides, 4 half-Heusler-alloys, [5][6][7] ternary and quaternary heavy metal chalcogenides, [8][9][10][11] and layered cobalt oxides. [12][13][14] In addition, the efficiency of well-known thermoelectric materials such as Bi 2 Te 3 and PbTe has been improved dramatically by incorporation into nanostructured devices.…”

Thermoelectric transport properties of highly oriented FeSb2 thin films

“…However, TMs with ZT ϳ 1 are still relatively few, especially for the TMs working below 200 K. Although there is a need for thermoelectric refrigeration, e.g., for refrigeration of superconductors in power cables, only few useful TMs working at low temperature have been found in the past 40 years. [4][5][6] The strongly correlated semiconductor FeSb 2 is a promising TM. 7,8 Polycrystalline FeSb 2 , FeSb 2−x Sn x , and FeSb 2−x Te x have been explored and shown to have moderate thermoelectric performance.…”

Synthesis and Crystal Structure of the New Mixed‐metal Bismuth Indium Sulfide, Bi0.76In1.24S3

“…6 Compared with In, Bi atoms adopt much more complicated coordinations. While distorted, octahedral and monocapped trigonal prismatic Bi coordinations are found in Bi 2 In 4 S 9 , 6 mixed mono-and bi-capped trigonal prisms around Bi atoms exist in Bi 3 In 5 S 12 , Bi 3 In 4 S 10 , and Bi 14.7 In 11.3 S 38 . 5,7 It is surprising that the simplest ternary phase, BiInS 3 , has not been structurally studied although the existence of the phase has been identified.…”

“…While distorted, octahedral and monocapped trigonal prismatic Bi coordinations are found in Bi 2 In 4 S 9 , 6 mixed mono-and bi-capped trigonal prisms around Bi atoms exist in Bi 3 In 5 S 12 , Bi 3 In 4 S 10 , and Bi 14.7 In 11.3 S 38 . 5,7 It is surprising that the simplest ternary phase, BiInS 3 , has not been structurally studied although the existence of the phase has been identified. 8 The cell parameters and possible space groups from the powder diffraction data have been inferred, however, no detailed structural investigation has been reported yet.…”