Diffusion-Controlled Formation of Ti<sub>2</sub>O<sub>3</sub> during Spark-Plasma Synthesis - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2013

Diffusion-Controlled Formation of Ti2O3 during Spark-Plasma Synthesis

Résumé

The spark-plasma-sintering (SPS) technique has successfully been applied for the single-step direct synthesis of Ti2O3 from a mixture of powders of rutile/anatase with titanium. The components react by diffusion through the grain boundaries, forming several intermediate phases locally. A single-phase material of titanium(III) oxide is obtained in compact bulk form after 180 min of SPS treatment at 1473 K. The electrical and thermal transport properties of such a SPS-prepared material measured in the temperature range between 300 and 800 K reflect the known semiconductor-to-metal transition above 400 K. The observed metallic-like electrical and thermal conductivity above this temperature is in good agreement with previously reported results. A maximum of the thermoelectric figure-of-merit ZT = 0.04 is achieved at 350 K.
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Dates et versions

hal-01288550 , version 1 (15-03-2016)

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Igor Veremchuk, Iryna Antonyshyn, Christophe Candolfi, Xianjuan Feng, Ulrich Burkhardt, et al.. Diffusion-Controlled Formation of Ti2O3 during Spark-Plasma Synthesis. Inorganic Chemistry, 2013, 52 (8), pp.4458-4463. ⟨10.1021/ic3027094⟩. ⟨hal-01288550⟩
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