title: Diffusion-controlled formation of Ti2O3 during spark-plasma synthesis.
abstract: 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.
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straβe 40, 01187 Dresden, Germany. Igor.Veremchuk@cpfs.mpg.de
authors.forename: I
authors.initials: I
authors.lastname: Veremchuk
authors.forename: I
authors.initials: I
authors.lastname: Antonyshyn
authors.forename: C
authors.initials: C
authors.lastname: Candolfi
authors.forename: X
authors.initials: X
authors.lastname: Feng
authors.forename: U
authors.initials: U
authors.lastname: Burkhardt
authors.forename: M
authors.initials: M
authors.lastname: Baitinger
authors.forename: J-T
authors.initials: JT
authors.lastname: Zhao
authors.forename: Yu
authors.initials: Y
authors.lastname: Grin