A multiscale approach to enhance the thermoelectric properties of α-SrSi 2 - Université de Montpellier
Communication Dans Un Congrès Année : 2024

A multiscale approach to enhance the thermoelectric properties of α-SrSi 2

Rana Ghannam
  • Fonction : Auteur
Loic Coulomb
  • Fonction : Auteur
Adrien Moll
  • Fonction : Auteur
David Bérardan
  • Fonction : Auteur
David Maurin
  • Fonction : Auteur
Jean-Louis Bantignies
Olivia Mauguin
  • Fonction : Auteur
Antonio Vieira E Silva
  • Fonction : Auteur
Benjamin Villeroy
  • Fonction : Auteur
J Rouquette
G Chevallier
  • Fonction : Auteur
C Estournès
  • Fonction : Auteur
Romain Viennois
  • Fonction : Auteur

Résumé

Conventional thermoelectric materials such as Bi2Te3 have the best performances at room temperature and can reach a ZT about 1. However, the cost, the toxicity and the scarcity of Te limit the application of thermoelectric materials in the low temperature range (300 – 600K). The use of eco-friendly elements such as silicides alloys could overcome these concerns. Among them Mn-Si and Mg2(Si,Sn) reached a maximum figure of merit of 0.63 (723 K) and 0.8 (650 K) respectively [1,2] and α-SrSi2 reaches a ZT about 0.15 at 300K which is the highest value for a silicide alloy at this temperature. The power factor of α-SrSi2 is close to that of Bi2Te3 however its thermal conductivity (~5 W/m.K) limit its performances. In this work, we investigate the effect of the nanostructuring, Sr purity and substitution on the thermal and thermoelectric properties of α-SrSi2 combining different metallurgical techniques [3,4]. We have shown that the nanostructuring by ball milling leads to an increase of the unit cell and of the concentration of defects which both modify the electronic band structure and phonon scattering. With this approach the lattice thermal conductivity contribution was decreased close to that expected to highly disordered or amorphous materials without impacting much the power factor. This multiscale approach enabled to improve the figure of merit to about 60% compared to our bulk reference. [1]Y. Sadia, L. Dinnerman, Y. Gelbstein, Mechanical alloying and spark plasma sintering of higher manganese silicides for thermoelectric applications, J Electron Mater. 42 (2013) [2]G. Jiang, J. He, T. Zhu, C. Fu, X. Liu, L. Hu, X. Zhao, High performance Mg2(Si,Sn) solid solutions: A point defect chemistry approach to enhancing thermoelectric properties, Adv Funct Mater. 24 (2014) [3]R. Ghannam, A. Moll, D. Bérardan, L. Coulomb, A. Vieira-E-Silva, B. Villeroy, R. Viennois, Mickaël Beaudhuin, Impact of the nanostructuring on the thermal and thermoelectric properties of α-SrSi2, J Alloys Compound 968 (2023) 171876 [4]R. Ghannam, L. Coulomb, A. Moll, D. Bérardan, A. Vieira-E-Silva, B. Villeroy, R. Viennois, Mickaël Beaudhuin, Enhanced thermoelectric properties of p-type α-SrSi2 nanostructured by melt spinning, J. solid state sci 147 (2024) 107406

Domaines

Chimie
Fichier non déposé

Dates et versions

hal-04789126 , version 1 (18-11-2024)

Identifiants

  • HAL Id : hal-04789126 , version 1

Citer

Rana Ghannam, Loic Coulomb, Adrien Moll, David Bérardan, David Maurin, et al.. A multiscale approach to enhance the thermoelectric properties of α-SrSi 2. Congrès SCF de la division chimie du solide, Nov 2024, Montpellier, France. ⟨hal-04789126⟩
1 Consultations
0 Téléchargements

Partager

More