Improvements in the thermoelectric efficiency of SrTiO3 through donor doping

被引：16

作者：

Bakhshi, Hamed ^{[1
,2
]}

Sarraf-Mamoory, Rasoul ^{[2
]}

Yourdkhani, Amin ^{[2
]}

Song, Shaochang ^{[1
]}

Tseng, Yu-Chih ^{[3
]}

Mozharivskyj, Yurij ^{[1
]}

机构：

[1] McMaster Univ, Brockhouse Inst Mat Res, Dept Chem & Chem Biol, 1280 Main St West, Hamilton, ON L8S 4M1, Canada

[2] Tarbiat Modares Univ, Dept Mat Engn, Tehran, Iran

[3] Nat Resources Canada, CanmetMAT, Hamilton, ON, Canada

来源：

CERAMICS INTERNATIONAL | 2022年 / 48卷 / 04期

关键词：

SrTiO3; Donor doping; Thermoelectric properties; Electrical conductivity; NB-DOPED SRTIO3; THERMAL-CONDUCTIVITY; PERFORMANCE; LA; CERAMICS;

D O I：

10.1016/j.ceramint.2021.11.131

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The SrTiO3 perovskites n-doped with Sm3+, Dy3+, and Nb5+ were prepared via the conventional solid state reaction route (SSR) followed by spark plasma sintering (SPS) process. The SPS in dynamic vacuum promotes formation of Ti3+ and Nb4+ species, as verified by the XPS analysis. Presence of the reduced cations, primarily Ti3+, is in agreement with the observed color changes and enhanced electrical conductivity of the samples. The Sr-site substitution by Sm and Dy is highly effective in phonon scattering and reducing the lattice thermal conductivity. Besides, this substitution significantly increases the electron mobility and electrical conductivity, by reducing the lattice strain imposed by the Ti/Nb substitution. Thermoelectric measurements indicated that a doubly doped sample with the Sr0.95Sm0.05Ti0.9Nb0.1O3 loading chemical composition reached the figure of merit (zT) value of 0.41 at 873 K. Such a high zT value originates primarily from a high carrier mobility of 24 cm(2)/V s and a low thermal conductivity of 2.4 W/m K.

引用

页码：5831 / 5839

页数：9

共 48 条

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