The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

Materials

Guanghui Rao¹  Jingtai Zhao¹  Tianyao Weng²  Jianguo Chen²  Jiye Zhang²  Jun Luo²  Fan Yang²  Han Li³  Kai Guo³ 

[1] School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China;School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China;

关键词: strontium titanate;    rare earth doping;    composite;    thermal expansion;    lattice thermal conductivity;   

DOI  :  10.3390/ma14216279

来源: DOAJ

【 摘 要 】

Donor-doped strontium titanate (SrTiO₃) 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 Sc₂O₃ composite suppresses multifrequency phonon transport, leading to low thermal conductivity of κ = 3.78 W·m⁻¹·K⁻¹ at 773 K for sample Sr_0.88La_0.06Sc_0.06TiO₃ with the highest doping content. Thus, the thermoelectric performance of SrTiO₃ can be significantly enhanced by synergistic optimization of electrical transport and thermal transport properties via cation doping and composite engineering.

【 授权许可】

Unknown