无机材料学报2023，Vol.38Issue(5)：577-582,6.DOI:10.15541/jim20220318
一步法制备重费米子YbAl3热电材料及其性能提升
Heavy-Fermion YbAl3 Materials:One-step Synthesis and Enhanced Thermoelectric Performance
摘要
Abstract
Microstructure plays a key role in tuning physical properties of materials.Here YbAl3 materials with high figure of merit ZT of 0.35 at 300 K was directly synthesized with Yb and Al pure powders through one-step spark plasma sintering process in 10 min.The excellent thermoelectric performance is attributed to the simultaneous reduction in the lattice thermal conductivity by 47% and electronic thermal conductivity by 27% at 300 K.The remarkable decrease in the electronic thermal conductivity is ascribed to the enhanced scattering of electrons by nanocrystals with 5-20 nm in diameter,strip-like non-crystal with several nanometers in width and various atomic-scale distortions.The substantial decline in the lattice thermal conductivity originates from the enhanced scattering of phonons due to multi-scale microstructures spanning from nanoscale to mesoscale.This work demonstrates that one-step spark plasma sintering process is an efficient strategy to rapidly synthesize YbAl3 materials with multi-scale microstructures and enhanced thermoelectric performance.关键词
YbAl3热电材料/一步法合成/微结构/热电性能Key words
YbAl3 thermoelectric materials/one-step synthesis/microstructure/thermoelectric performance分类
化学化工引用本文复制引用
贺丹琪,魏明旭,刘蕤之,汤志鑫,翟鹏程,赵文俞..一步法制备重费米子YbAl3热电材料及其性能提升[J].无机材料学报,2023,38(5):577-582,6.基金项目
National Key Research and Development Program of China(2018YFB0703603,2019YFA0704903) （2018YFB0703603,2019YFA0704903）
National Natural Science Foundation of China(11834012,52130203,52102298) （11834012,52130203,52102298）
Foshan Xianhu Laboratory of the Advanced Energy Scienc eand Technology Guangdong Laboratory(XHT2020-004) （XHT2020-004）
National Innovation And Entrepreneurship Training Program for College Students(312040000245) （312040000245）
