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Modulation of electrical and thermal transports through lattice distortion in BaTi1-x Nb x O3 solid solutions

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Title: Modulation of electrical and thermal transports through lattice distortion in BaTi1-x Nb x O3 solid solutions
Authors: Zhang, Yuqiao Browse this author
Cho, Hai Jun Browse this author
Jiang, Feng Browse this author
Xia, Chengliang Browse this author
Chen, Yue Browse this author
Liu, Weishu Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: electrical conductivity
thermal conductivity
phase transition
Issue Date: 13-Jul-2022
Publisher: IOP Publishing
Journal Title: Nanotechnology
Volume: 33
Issue: 40
Start Page: 405702
Publisher DOI: 10.1088/1361-6528/ac78f3
Abstract: The electron and heat transports in solids are through the movement of carrier electrons and quantized lattice vibrations (phonons), which are sensitive to the lattice distortion and ionized impurities, and are essential aspects for the development of novel thermoelectric materials. In this study, we systematically investigated the modulations of electrical and thermal conductivities of BaTi1-x Nb x O3 solid solution (BTNO, 0 <= x <= 1) epitaxial films. At room temperature, BaTiO3 belongs to tetragonal perovskite and exhibits electron conduction through doubly degenerated Ti 3d-t(2g) orbitals upon doping, while BaNbO3 belongs to cubic perovskite and exhibits metallic electron conduction through partially filled triply degenerate Nb 4d-t(2g) orbitals. By controlling the Ti/Nb ratio, we found a dual modulation effect on both the lattice structures and conduction band, which affects the electrical and thermal conductivities. Similar to the SrTi1-x Nb x O3 solid solution (STNO, 0 <= x <= 1) system, a phase transition was detected at x similar to 0.5, at which both the electron and heat transports exhibit abrupt changes. Unlike the transition in STNO, which was attributed to a polaronic phase transition, the transition in BTNO was due to contributions from both the lattice distortion and polaron effect. By controlling the lattice distortion, conduction band, and polaronic phase transitions, the electrical and thermal conductivity of BTNO epitaxial films are modulated within a much greater range than those of the STNO epitaxial films. Due to the double contribution of electron carriers and phonon to thermal conductivity (kappa), the maximum kappa modulation ratio of BTNO epitaxial films was similar to 6.9. Our research provides an effective route to design electrical/thermal management materials.
Rights: This is the Accepted Manuscript version of an article accepted for publication in Nanotechnology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
Type: article (author version)
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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