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Optimization of the Telluride Tl 10– x – y Sn x Bi y Te 6 for the Thermoelectric Energy Conversion
Author(s) -
Kuropatwa Bryan A.,
Guo Quansheng,
Assoud Abdeljalil,
Kleinke Holger
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300577
Subject(s) - seebeck coefficient , thermoelectric effect , analytical chemistry (journal) , bismuth telluride , tellurium , figure of merit , materials science , electrical resistivity and conductivity , ternary operation , telluride , crystallography , chemistry , physics , metallurgy , thermodynamics , optoelectronics , chromatography , quantum mechanics , computer science , programming language
We present the thermoelectric properties of the quaternary telluride series Tl 10– x – y Sn x Bi y Te 6 including Seebeck coefficient ( S ), electrical conductivity ( σ ), and thermal conductivity ( κ ). Three different Tl concentrations, namely 9, 8.67, and 8.33 Tl per formula unit, were selected followed by variations of the Sn:Bi ratio to tune the properties at each Tl concentration. Additionally, crystal structure data and electronic structure calculations were used to model the data and support the findings. The Tl 9 (Sn, Bi)Te 6 system was found to have the highest power factor ( S 2 σ ) displaying a value of 8.1 μW · cm –1 · K –2 at 587 K, realized with Tl 9 Sn 0.2 Bi 0.8 Te 6 . Tl 8.67 Sn 0.50 Bi 0.83 Te 6 however, displays values closer to 4 μW · cm –1 · K –2 at comparable temperatures. Ultimately, the thermoelectric Figure‐of‐merit was determined to reach a competitive 0.6 at 575 K and 525 K for Tl 8.33 Sn 1.12 Bi 0.55 Te 6 and Tl 8.67 Sn 0.50 Bi 0.83 Te 6 , respectively, thereby outperforming the ternary variants Tl 10– x Sn x Te 6 .