Fabrication of Non-Stoichiometric Titanium Dioxide by Spark Plasma Sintering and Its Thermoelectric Properties

被引：17
作者：
Lu, Yun [1 ,2 ]
Sagara, Katsuhiro [1 ,2 ]
Hao, Liang [1 ,2 ]
Ji, Ziwu [3 ]
Yoshida, Hiroyuki [4 ]
机构：
[1] Chiba Univ, Grad Sch, Chiba 2638522, Japan
[2] Chiba Univ, Fac Engn, Chiba 2638522, Japan
[3] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China
[4] Chiba Ind Technol Res Inst, Chiba 2640017, Japan
来源：
MATERIALS TRANSACTIONS | 2012年 / 53卷 / 07期
关键词：
titanium dioxide; spark plasma sintering; graphite die; reduction reaction; non-stoichiometric; thermoelectric property; TIO2-X THIN-FILMS; OXIDES; PHOTOCATALYSIS; DEGRADATION; REDUCTION;
D O I：
10.2320/matertrans.E-M2012808
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To obtain non-stoichiometric titanium dioxide, TiO2 powder was sintered in a graphite die by spark plasma sintering (SPS). The microstructure and the crystal type of the compacts were examined. Thermoelectric properties of the compacts were measured and discussed. The results revealed that TiO2 could be easy to be reduced in the graphite die by SPS to obtain non-stoichiometric titanium dioxide, TiO2-x, with uniform composition distribution. Electrical resistivity of the compacts decreased with increase of SPS temperature. Seebeck coefficient also decreased with increase of SPS temperature, but kept large absolute values over 300 mu V.K-1. Therefore, the compacts fabricated by SPS showed relatively high thermoelectric performance. The power factor reached 5 x 10(-5) W m(-1) K-2 at 523 K. [doi:10.2320/matertrans.E-M2012808]
引用
收藏
页码：1208 / 1211
页数：4
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