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Thermoelectric phase diagram of the SrTiO3-SrNbO3 solid solution system

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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
Type: article
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)

Submitter: 太田 裕道

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