Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass-crystal composite system Si<sub>10</sub>As<sub>15</sub>Te<sub>75</sub>–Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Materials Chemistry C Année : 2015

Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass-crystal composite system Si10As15Te75–Bi0.4Sb1.6Te3

Eric Alleno
Judith Monnier
Christophe Candolfi
Anne Dauscher
Bertrand Lenoir

Résumé

We report on the theoretical predictions of the effective medium theory (EMT) and its generalized version taking into account percolation theory (GEMT) on the thermoelectric properties of composites based on Landauer and Sonntag’s equations. The results were tested experimentally on composites composed of the glassy phase Si10As15Te75 and the crystalline phase Bi0.4Sb1.6Te3. The evolution of the electrical resistivity and thermal conductivity with the fraction of crystalline phase matches very well the experimental data, although the GEMT model fails to predict the thermopower. A better agreement between theory and experiment could be obtained by combining the principles of the GEMT and the Webman–Jortner–Cohen models. Despite the fact that the GEMT model originally predicts the possibility to optimize the dimensionless figure of merit ZT of composites by adjusting the fraction and the values of the transport properties of each phase, the new model developed rules out any beneficial influence on the ZT values. These results confirm within a different framework the early conclusions of Bergman regarding the impossibility of improving the ZT values using multi-phased materials.
Fichier principal
Vignette du fichier
Revised manuscript.pdf (1.08 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01223021 , version 1 (09-03-2023)

Identifiants

Citer

Jean-Baptiste Vaney, Andrea Piarristeguy, Viktoriia Ohorodniichuck, Olivier Ferry, Annie Pradel, et al.. Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass-crystal composite system Si10As15Te75–Bi0.4Sb1.6Te3. Journal of Materials Chemistry C, 2015, 3, pp.11090-11098. ⟨10.1039/c5tc02087e⟩. ⟨hal-01223021⟩
301 Consultations
22 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More