Influence of S and Te substitutions on the thermoelectric properties of the cluster compound Ag3.8Mo9Se11

JOURNAL OF ALLOYS AND COMPOUNDS

卷:739

Article

Masschelein, P.¹  Candolfi, C.¹  Dauscher, A.¹  Gendarme, C.¹  Rabih, Al Rahal Al Orabi^2,3  Gougeon, P.²  Potel, M.²  Gall, P.²  Gautier, R.²  Lenoir, B.¹ 

[1] Univ Lorraine, Inst Jean Lamour, CNRS, UMR 7198, 2 Allee Andre Guinier Campus ARTEM, F-54011 Nancy, France

[2] Univ Rennes 1, Ecole Natl Super Chim Rennes, Sci Chim Rennes, CNRS,INSA,UMR 6226, Ave Gen Leclerc, F-35042 Rennes, France

[3] AXELONE Collaborat Platform Innovat Mat, Adv Polymers & Mat Dept ARTI APMD, 87 Rue Freres Perret,BP62, F-69192 St Fons, France

关键词: Reduced molybdenum selenide;    Molybdenum clusters;    Thermoelectric properties;   

DOI  :  10.1016/j.jallcom.2017.12.213

来源: Elsevier

【 摘 要 】

We report on a detailed study of the influence of S and Te substitutions for Se on the thermoelectric properties of the cluster compound Ag3.8Mo9Se11. Two series of polycrystalline samples Ag3.8Mo9Se11-ySy (0 <= y <= 0.5) and Ag3.8Mo9Se11-zTez (0 <= z <= 0.5) were synthesized by a combination of conventional powder metallurgy technique followed by spark plasma sintering. Powder X-ray diffraction and wavelength dispersive spectroscopy indicate that both S and Te successfully substitute for Se and exhibit a low solubility limit of y approximate to z approximate to 0.5. Measurements of the thermoelectric properties between 2 and 800 K show that S and Te substitutions tend to lead to a more pronounced heavily-doped character with respect to Ag3.8Mo9Se11. The very low lattice thermal conductivity of these compounds (k(L) approximate to 0.5 Wm(-1) K-1) can be attributed to the large thermal displacement parameters of the Ag atoms. Despite the heavily-doped nature of the samples, the charge carriers conduct less heat than expected by the Wiedemann-Franz law resulting in significantly lower Lorenz numbers than predicted by the degenerate limit above 300 K. The combination of favourable electronic properties and low thermal conductivity leads to interesting dimensionless thermoelectric figures of merit ZT of 0.7 near 800 K. (c) 2017 Elsevier B.V. All rights reserved.

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