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Thermoelectric Properties and Phase Transition of (ZnxCu2−x)V2O7
| Title: | Thermoelectric Properties and Phase Transition of (ZnxCu2−x)V2O7 |
| Authors: | Sotojima, Kotaro Browse this author | | Suzuki, Ryosuke O. Browse this author →KAKEN DB | | Amezawa, Koji Browse this author | | Tomii, Yoichi Browse this author |
| Keywords: | Seebeck coefficient | | electrical resistivity | | vanadium oxide | | phase diagram | | layered structure |
| Issue Date: | 2007 |
| Publisher: | Thermoelectrics Society of Japan |
| Journal Title: | Materials Transactions |
| Volume: | 48 |
| Issue: | 8 |
| Start Page: | 2094 |
| End Page: | 2099 |
| Publisher DOI: | 10.2320/matertrans.E-MRA2007856 |
| Abstract: | The phase stability and thermoelectric properties of the layered structure of (ZnxCu2-x)V2O7 solid solutions were studied for x ≥ 0.2. X-ray diffraction measurements, compositional studies, and thermal analysis verified that the low-temperature form of the (ZnxCu2-x)V2O7 solid solution (monoclinic structure, C2/c) was stable for 0.2 ≤ x ≤ 2 when heated below 863K in air. On heating, phase transformation occurred at least at 0.2 ≤ x ≤ 2 at a nearly constant temperature of approximately 873 K; above this temperature, a high-temperature form of the (ZnxCu2-x)V2O7 solid solution was formed. The Seebeck coefficients of the low-temperature (ZnxCu2-x)V2O7 solid solution exhibited large negative values in the range of approximately -520 to -700 μV/K, and the electrical resistivity increased with Zn addition. The maximum power factor of 1.99 x 10^[-7] W/mK2 was obtained at 823K for the low-temperature form of the (Zn0.2Cu1.8)V2O7 solid solution. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/50114 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鈴木 亮輔
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