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Article Dans Une Revue Chemistry of Materials Année : 2017

Sb Doping of Metallic CuCr2S4 as a Route to Highly Improved Thermoelectric Properties

Atta Ullah Khan
  • Fonction : Auteur
Rabih Al Rahal Al Orabi
Amir Pakdel
  • Fonction : Auteur
Jean-Baptiste Vaney
Bruno Fontaine
Seiji Mitani
  • Fonction : Auteur
Takao Mori

Résumé

We report for the first time the thermoelectric properties of CuCr2-xSbxS4 (0.22 <= x <= 0.5). Although CuCr2S4 has been reported to be a metallic compound, addition of Sb shifts the material toward the semiconductor side. This is confirmed by band structure calculations of CuCr2-xSbxS4 (x = 0, 0.25, 0.5) models. Increasing Sb content enhances the power factor. However, beyond x = 0.3, further Sb addition lowers the electrical conductivity and power factor. A very interesting point is the simultaneous increase of the Seebeck coefficient as well as the electrical conductivity with increasing temperature, which acts like a variable range hopping (VRH) compounds but possesses much better properties than those having VRH. Samples were annealed for 48 h prior to thermoelectric properties measurements to have a reliable dimensionless figure of merit (ZT). An attractive ZT of 0.43 is obtained at similar to 650 degrees C. The attractive thermoelectric properties we discovered by driving a metal compound into a semiconductor make this compound an interesting thermoelectric material especially because of the cheap constituent elements compared to those of typical state-of-the-art thermoelectric materials. Furthermore, this material is stable up to 650 degrees C at least, a relatively high temperature for sulfides. Additionally, we discovered a miscibility gap in this solid solution close to an Sb content of 0.15; although a detailed study dedicated entirely to this miscibility gap would be required, it will encourage the researchers to further explore this system.

Domaines

Chimie
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Dates et versions

hal-01532169 , version 1 (02-06-2017)

Identifiants

Citer

Atta Ullah Khan, Rabih Al Rahal Al Orabi, Amir Pakdel, Jean-Baptiste Vaney, Bruno Fontaine, et al.. Sb Doping of Metallic CuCr2S4 as a Route to Highly Improved Thermoelectric Properties. Chemistry of Materials, 2017, 29 (7), pp.2988--2996. ⟨10.1021/acs.chemmater.6b05344⟩. ⟨hal-01532169⟩
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