Paper Title:

Fabrication and Thermoelectric Properties of Magneli Phases by Adding Ti into TiO2

Periodical Advanced Materials Research (Volumes 415 - 417)
Main Theme Advanced Materials
Edited by Jinglong Bu, Zhengyi Jiang and Sihai Jiao
Pages 1291-1296
DOI 10.4028/www.scientific.net/AMR.415-417.1291
Citation Yun Lu et al., 2011, Advanced Materials Research, 415-417, 1291
Online since December, 2011
Authors Yun Lu, Yusuke Matsuda, Katsuhiro Sagara, Liang Hao, Takahito Otomitsu, Hiroyuki Yoshida
Keywords Magneli Phase, Nonstoichiometric Compound, Spark Plasma Sintering (SPS), Thermoelectric Property, TiO2, Titanium Addition
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Abstract

In the present study, the TiO2-Ti compacts with Magneli phases TinO2n-1 were fabricated using the mixed powder of TiO2 powder and addition Ti powder by spark plasma sintering (SPS). The composition and the crystal types of Magneli phases TinO2n-1 were examined. The results showed that various Magneli phases TinO2n-1 (single or multi Magneli phases) with the composition of Ti1+yO2-x were obtained. The Magneli phases TinO2n-1 were formed in the transformation from the mother phase rutile TiO2 to TiO with increase in Ti addition fraction. In addition, the thermoelectric properties of the sintered compacts were also measured. The electrical resistivity of the sintered compacts decreased with increase in Ti addition fraction. The thermoelectric performance of the sintered compacts was improved by the formation of Magneli phases TinO2n-1 with the composition of Ti1+yO2-x.