Latent Property of Defect-Controlled Metal Oxide: Nonstoichiometric Titanium Oxides as Prospective Material for High-Temperature Thermoelectric Conversion
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概要
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The thermoelectric properties of a nonstoichiometric titanium oxide (TiO1.1) are investigated in terms of materials for high-temperature thermoelectric conversion. The electrical conductivity $\sigma$ of TiO1.1 increases to 9000 S/m at 800 °C showing semiconducting behavior. The Seebeck coefficient $\alpha$ of TiO1.1 shows a general trend in which the value increases gradually from 0.380 mV/K at 300 °C to 1.01 mV/K at 950 °C. As a consequence, the power factor $\alpha^{2}\sigma$ reaches $8.61\times 10^{-3}$ W/(m$\cdot$K2), the largest value for all reported oxide materials. The thermal conductivity $\kappa$ of TiO1.1 increases with temperature, from 1.26 W/(m$\cdot$K) at 300 °C to 7.12 W/(m$\cdot$K) at 950 °C. In spite of the considerably large values of $\kappa$, the figure of merit $Z=\alpha^{2}\sigma/\kappa$ reaches $1.59\times 10^{-3}$ K-1 for TiO1.1 at 700 °C. The extremely large power factor of TiO1.1 compared to other metal oxides can be attributed to the optimal carrier density. The dimensionless figure of merit $ZT$ of 1.64 attained by TiO1.1 at 800 °C is the largest value for all reported thermoelectric materials in this temperature region. Moreover, the fact that TiO1.1 has $ZT$ values of nearly unity or greater in the range from 500 to 1000 °C demonstrates the usefulness of nonstoichiometric titanium oxides for high-temperature thermoelectric conversion.
- 2006-09-15
著者
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Okinaka Noriyuki
Center for Advanced Research of Energy and Materials, Hokkaido University
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Akiyama Tomohiro
Center For Advanced Research Of Energy And Materials Faculty Of Engineering Hokkaido University
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Okinaka Noriyuki
Center for Advanced Research of Energy Conversion Materials, Hokkaido University, Sapporo 060-8628, Japan
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Akiyama Tomohiro
Center for Advanced Research of Energy Conversion Materials, Hokkaido University, Sapporo 060-8628, Japan
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