日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 78, No. 3 (2014),
pp. 109-116

Fabrication of Ti1-xCrxOz and Analysis of Its Microstructure and Thermoelectric Properties

Katsuhiro Sagara1, Yun Lu1, Yuta Kikuchi1, Takahiro Nozue1, Satoshi Ogura1, Hiroyuki Yoshida2 and Hiroshi Asanuma1

1Graduate School & Faculty of Engineering, Chiba University, Chiba 263-8522
2Chiba Industrial Technology Research Institute, Chiba 263-0016

Abstract:

To obtain Ti1-xCrxOz, mixed powder of TiO2 and Cr powders was sintered in a graphite die by spark plasma sintering (SPS). The composition and the microstructure of the sintered compacts were examined by XRD and SEM. In addition, the thermoelectric properties of the sintered compacts were measured, the relationship of the thermoelectric properties and phases was also discussed. The results showed that the multiphase with compositions of TinO2n-1, TiCrO3 and Cr was obtained. The phases formed in a transformation from the rutile type TiO2 to TiCrO3 with the reduction during SPS and an increase in Cr additive fraction. The electrical resistivity of the sintered compacts greatly decreased due to an increase in Cr additive fraction. The thermoelectric performance of the sintered compacts was enhanced obviously, and the largest power factor of Ti1-xCrxOz with x=0.25 reached 0.57 mW/K2m at 973 K. [doi:10.2320/jinstmet.J2013071]


(Received 2013/10/29)

Keywords:

titanium oxide, thermoelectric property, metal addition, shear structure, Magnéli phase


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.