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Thermoelectric anisotropy and texture of intercalated TiS2

Abstract : This study addresses the effect of anisotropy on the electrical and thermal properties of CuxTiS2 compounds. We show that the anisotropy of the electrical resistivity (rho(cross-plane)/rho(in-plane) > 1) tends to be reduced as the covalent character along c is increased with the Cu content. For all x values (x <= 0.1), the absolute value of S is always found to be higher in-plane than in the cross-plane direction due to band structure anisotropy, leading to higher in-plane power factor values. Interestingly, the kappa(in-plane)/kappa(cross-plane) thermal conductivity ratio, with values similar to the only data reported for TiS2 crystals, are always higher than rho(cross-plane)/rho(in-plane). This anisotropy relation leads to equivalent zT values for the in-plane and cross-plane directions, reaching 0.35-0.5 at 800K. Published by AIP Publishing.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02175435
Contributor : Elisabeth van T Hof <>
Submitted on : Friday, July 5, 2019 - 5:01:54 PM
Last modification on : Wednesday, August 28, 2019 - 12:50:05 PM

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E. Guilmeau, T. Barbier, A. Maignan, D. Chateigner. Thermoelectric anisotropy and texture of intercalated TiS2. Applied Physics Letters, American Institute of Physics, 2017, 111 (13), ⟨10.1063/1.4998952⟩. ⟨hal-02175435⟩

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