Paper Title:
Thermoelectric Iron Oxides
| Periodical | Advances in Science and Technology (Volume 74) |
|---|---|
| Main Theme | 5th FORUM ON NEW MATERIALS PART C |
| Edited by | Pietro VINCENZINI, Kunihito KOUMOTO, Nicola ROMEO and Mark MEHOS |
| Pages | 66-71 |
| DOI | 10.4028/www.scientific.net/AST.74.66 |
| Citation | Tsuyoshi Kajitani et al., 2010, Advances in Science and Technology, 74, 66 |
| Online since | October, 2010 |
| Authors | Tsuyoshi Kajitani, Tomohiro Nozaki, Kei Hayashi |
| Keywords | Delafossite Structure, Iron Oxide, Spinel Structure, Thermoelectric Property |
| Price | US$ 28,- |
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Abstract
P- and N-type thermoelectric iron oxides were developed. The p- and n-type thermoelectric iron oxides were based on delafossite-type CuFeO2 and spinel-type Fe3O4, respectively. The dimensionless figure of merit, ZT, of the bulk p- and n-type iron oxides were 0.15 and 0.10 at 1200K, respectively. The ZT values were improved by the introduction of nano-voids. The physical properties of these iron oxides are structurally unique because of the triangular, or “Kagome,” arrangement of FeO6 octahedra. The delafossite-type CuFeO2 becomes anti-ferromagnet at temperatures less than 20K. The inverse spinel-type Fe3O4 is a ferrimagnet at room temperature. In both crystals, the iron ions are assumed to be in the high-spin state.
