Modeling The Thermoelectric Properties Of Ti5O9 Magnéli Phase Ceramics

Keywords

magnéli phase; nanoceramics; small polaron; Thermoelectrics; Ti O 5 9

Abstract

Magnéli phase Ti5O9 ceramics with 200-nm grain-size were fabricated by hot-pressing nanopowders of titanium and anatase TiO2 at 1223 K. The thermoelectric properties of these ceramics were investigated from room temperature to 1076 K. We show that the experimental variation of the electrical conductivity with temperature follows a non-adiabatic small-polaron model with an activation energy of 64 meV. In this paper, we propose a modified Heikes-Chaikin-Beni model, based on a canonical ensemble of closely spaced titanium t2g levels, to account for the temperature dependency of the Seebeck coefficient. Modeling of the thermal conductivity data reveals that the phonon contribution remains constant throughout the investigated temperature range. The thermoelectric figure-of-merit ZT of this nanoceramic material reaches 0.3 K at 1076 K.

Publication Date

11-1-2016

Publication Title

Journal of Electronic Materials

Volume

45

Issue

11

Number of Pages

5526-5532

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11664-016-4762-4

Socpus ID

84978902301 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84978902301

This document is currently not available here.

Share

COinS