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Thermoelectric phase diagram of the SrTiO3-SrNbO3 solid solution system
| Title: | Thermoelectric phase diagram of the SrTiO3-SrNbO3 solid solution system |
| Authors: | Zhang, Yuqiao Browse this author | | Feng, Bin Browse this author | | Hayashi, Hiroyuki Browse this author | | Tohei, Tetsuya Browse this author | | Tanaka, Isao Browse this author | | Ikuhara, Yuichi Browse this author | | Ohta, Hiromichi Browse this author →KAKEN DB |
| Issue Date: | 14-May-2017 |
| Publisher: | American Institute of Physics (AIP) |
| Journal Title: | Journal of Applied Physics |
| Volume: | 121 |
| Issue: | 18 |
| Start Page: | 185102 |
| Publisher DOI: | 10.1063/1.4983359 |
| Abstract: | Here, we present a thermoelectric phase diagram for the SrTi1-xNbxO3 (0.05 <= x <= 1) solid solution system, which we derived from the characterization of epitaxial films. We observed two thermoelectric phase boundaries in the system, which originate from the step-like decrease in carrier effective mass at x similar to 0.3 and from a local minimum in carrier relaxation time at x similar to 0.5. The origins of these phase boundaries are considered to be related to isovalent/heterovalent B-site substitution: parabolic Ti 3d orbitals dominate electron conduction for compositions with x < 0.3, whereas the Nb 4 d orbital dominates when x > 0.3. At x similar to 0.5, a tetragonal distortion of the lattice, in which the B-site is composed of Ti4+ and Nb4+ ions, leads to the formation of tail-like impurity bands, which maximizes the electron scattering. These results provide a foundation for further research into improving the thermoelectric performance of SrTi1-xNbxO3. Published by AIP Publishing. |
| Rights: | The following article appeared in J. Appl. Phys. 121, 185102 (2017) and may be found at http://dx.doi.org/10.1063/1.4983359 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/70213 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 太田 裕道
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