High-temperature thermoelectric properties of the β-As_2−xBi_xTe₃ solid solution

Jean-Baptiste Vaney (1) , Gaëlle Delaizir (2) , Andrea Piarristeguy (3) , Judith Monnier (4) , Eric Alleno (4) , Elsa B. Lopes (5) , Antonio Pereira Goncalves (5) , Annie Pradel (3) , Anne Dauscher (1) , Christophe Candolfi (1) , Bertrand Lenoir (1)

1 IJL - Institut Jean Lamour
2 IRCER - Institut de Recherche sur les CERamiques
3 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
4 ICMPE - Institut de Chimie et des Matériaux Paris-Est
5 Instituto Superior Técnico

Bi₂Te₃-based compounds are a well-known class of outstanding thermoelectric materials. β-As₂Te₃, another member of this family, exhibits promising thermoelectric properties around 400 K when appropriately doped. Herein, we investigate the high-temperature thermoelectric properties of the β-As_2−xBi_xTe₃ solid solution. Powder X-ray diffraction and scanning electron microscopy experiments showed that a solid solution only exists up to x = 0.035. We found that substituting Bi for As has a beneficial influence on the thermopower, which, combined with extremely low thermal conductivity values, results in a maximum ZT value of 0.7 at 423 K for x = 0.017 perpendicular to the pressing direction.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Chimie inorganique

Jean-Baptiste Vaney, Gaëlle Delaizir, Andrea Piarristeguy, Judith Monnier, Eric Alleno, et al.. High-temperature thermoelectric properties of the β-As_2−xBi_xTe₃ solid solution. APL Materials, 2016, 4 (10), pp.104901. ⟨10.1063/1.4950947⟩. ⟨hal-01337465⟩