Effects of Mn substitution on the thermoelectric properties of the electron-doped perovskite Sr1-xLaxTiO3

27th International Conference on Low Temperature Physics

Okuda, T.^1 ; Hata, H.^1 ; Eto, T.^1 ; Nishina, K.^2 ; Kuwahara, H.^2 ; Nakamura, M.^3 ; Kajimoto, R.^3

Graduate School of Science and Engineering, Kagoshima University, Kagoshima

890-0065, Japan^1

Department of Physics, Sophia University, Chiyoda, Tokyo

102-8554, Japan^2

J-PARC Center, Japan Atomic Energy Agency, Ibaraki

319-1195, Japan^3

关键词: Dimensionless figure of merit;    Electron-doped;    Jahn-Teller;    Local lattice distortion;    Mn substitution;    Power factors;    Thermoelectric properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022035/pdf
DOI  :  10.1088/1742-6596/568/2/022035

来源: IOP

【 摘 要 】

We have tried to improve The n-type thermoelectric properties of The electron- doped Perovskite Sr1-xLaxTiO3by a Mn substitution. The 1 ∼ 2 % Mn substitution enhances The Seebeck coefficient (S) and reduces The thermal conductivity (κ) by about 50 % at room temperature (RT) without largely increasing The resistivity for The 5 % electron-doped SrTiO3. Consequently, The power factor at RT keeps a large value comparable to that of Bi2Te3and The dimensionless figure-of-merits at RT increases twofold by The slight Mn substitution. Such a large reduction of κ at RT is perhaps due to The effect of Jahn-Teller active Mn3+ions, around which dynamical local lattice distortion may occur.