镧掺杂的 SrTiO 与 ScO 复合材料的电学和热输运性质

The Electrical and Thermal Transport Properties of La-Doped SrTiO with ScO Composite.

作者信息

Guo Kai, Yang Fan, Weng Tianyao, Chen Jianguo, Zhang Jiye, Luo Jun, Li Han, Rao Guanghui, Zhao Jingtai

机构信息

School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.

School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China.

出版信息

Materials (Basel). 2021 Oct 21;14(21):6279. doi: 10.3390/ma14216279.

DOI:10.3390/ma14216279

PMID:34771803

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8585205/

Abstract

Donor-doped strontium titanate (SrTiO) is one of the most promising n-type oxide thermoelectric materials. Routine doping of La at Sr site can change the charge scattering mechanism, and meanwhile can significantly increase the power factor in the temperature range of 423-773 K. In addition, the introduction of Sc partially substitutes Sr, thus further increasing the electron concentration and optimizing the electrical transport properties. Moreover, the excess Sc in the form of ScO composite suppresses multifrequency phonon transport, leading to low thermal conductivity of = 3.78 W·m·K at 773 K for sample SrLaScTiO with the highest doping content. Thus, the thermoelectric performance of SrTiO can be significantly enhanced by synergistic optimization of electrical transport and thermal transport properties via cation doping and composite engineering.

摘要

施主掺杂的钛酸锶（SrTiO）是最有前途的n型氧化物热电材料之一。在Sr位点常规掺杂La可以改变电荷散射机制，同时在423 - 773 K的温度范围内显著提高功率因子。此外，引入Sc部分替代Sr，从而进一步提高电子浓度并优化电输运性能。而且，以ScO复合物形式存在的过量Sc抑制多频声子输运，对于掺杂含量最高的样品SrLaScTiO，在773 K时导致低热导率κ = 3.78 W·m⁻¹·K⁻¹。因此，通过阳离子掺杂和复合工程协同优化电输运和热输运性能，可以显著提高SrTiO的热电性能。