Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straβe 40, 01187 Dresden, Germany.
Inorg Chem. 2013 Apr 15;52(8):4458-63. doi: 10.1021/ic3027094. Epub 2013 Mar 22.
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.
火花等离子烧结（SPS）技术已成功应用于通过金红石/锐钛矿与钛的混合物粉末一步直接合成 Ti2O3。通过在晶界中的扩散，各组分反应，在局部形成几个中间相。在 1473 K 下经过 180 min 的 SPS 处理后，可获得块状单相钛（III）氧化物材料。在 300 至 800 K 的温度范围内测量的这种 SPS 制备材料的电和热输运性质反映了在 400 K 以上已知的半导体-金属转变。在该温度以上观察到的金属状电导率和热导率与先前报道的结果非常吻合。在 350 K 时达到最大热电优值 ZT = 0.04。
