Enhancement of Thermoelectric Performance of Sr0.9La0.1TiO3-Based Ceramics Regulated by Nanostructures
Source abstract
Abstract
La-doped strontium titanite (Sr0.9La0.1TiO3) is a promising candidate for n-type oxide thermoelectric materials. However, the ZT values of this material are low, leading to low conversion efficiency. Improvements in this efficiency are required. In this work, a high ZT value of 0.50 was obtained for Sr0.9La0.1TiO3 ceramic samples by adding 10 wt % Bi2O3 sintering aids and 20 wt % nanosized Ti powders to the matrix material. Although Ti was oxidized to TiO2 during the sintering process, nanoscale phase interfaces were beneficial for phonon scattering and thermal conductivity reduction. Nanosized metallic Bi and Bi2O3 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 Bi2O3 sintering aid paves a way for enhancement of thermoelectric properties of oxide thermoelectric materials.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Phase Change Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
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
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin N.T. 999077, Hong Kong SAR, China
Funding
Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Northwestern Polytechnical University
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