纳米结构调控的SrLaTiO基陶瓷热电性能增强
Enhancement of Thermoelectric Performance of SrLaTiO-Based Ceramics Regulated by Nanostructures.
作者信息
Qin Mengjie, Lou Zhihao, Zhang Ping, Shi Zongmo, Xu Jie, Chen Yongsheng, Gao Feng
机构信息
State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China.
出版信息
ACS Appl Mater Interfaces. 2020 Dec 2;12(48):53899-53909. doi: 10.1021/acsami.0c13693. Epub 2020 Nov 18.
La-doped strontium titanite (SrLaTiO) is a promising candidate for n-type oxide thermoelectric materials. However, the values of this material are low, leading to low conversion efficiency. Improvements in this efficiency are required. In this work, a high value of 0.50 was obtained for SrLaTiO ceramic samples by adding 10 wt % BiO sintering aids and 20 wt % nanosized Ti powders to the matrix material. Although Ti was oxidized to TiO during the sintering process, nanoscale phase interfaces were beneficial for phonon scattering and thermal conductivity reduction. Nanosized metallic Bi and BiO particles were observed. These two factors played an important role in reducing the thermal conductivity from 2.5 W/(m K) at room temperature to 1.31 W/(m K) at 1073 K. Nanostructure control using nanosized metal powders as additives combined with the BiO sintering aid paves a way for enhancement of thermoelectric properties of oxide thermoelectric materials.
镧掺杂钛酸锶（SrLaTiO）是一种很有前景的n型氧化物热电材料候选物。然而，这种材料的数值较低，导致转换效率低下。需要提高这种效率。在这项工作中，通过向基体材料中添加10 wt%的BiO烧结助剂和20 wt%的纳米级Ti粉末，SrLaTiO陶瓷样品获得了0.50的高值。尽管Ti在烧结过程中被氧化成TiO，但纳米级相界面有利于声子散射和热导率降低。观察到了纳米级金属Bi和BiO颗粒。这两个因素在将热导率从室温下的2.5 W/(m·K)降低到1073 K时的1.31 W/(m·K)方面发挥了重要作用。使用纳米级金属粉末作为添加剂结合BiO烧结助剂进行纳米结构控制，为提高氧化物热电材料的热电性能铺平了道路。
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