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Ru Alloying Induced Enhanced Thermoelectric Performance in FeSi2-Based Compounds
Du, Xiaolong; Hu, Ping; Mao, Tao; Song, Qingfeng; Qiu, Pengfei; Shi, Xun; Chen, Lidong
2019-09-04
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume11Issue:35Pages:32151
SubtypeArticle
Abstractbeta-FeSi2 has been considered a promising material for thermoelectric applications, but its thermoelectric performance is greatly limited by the overhigh lattice thermal conductivity. In thermoelectrics, alloying an effective method to reduce the lattice thermal conductivity. In this study, we chose the Co-doped beta-FeSi2 (Fe0.94Co0.06Si2) as the matrix and then prepared a series of Ru alloyed Fe0.94-xRuxCo0.06Si2 (x = 0, 0.005, 0.01, 0.02, and 0.05). X-ray characterizations show that all samples crystallize in the beta-FeSi2 structure. The elemental mappings detect an inhomogeneous Ru distribution in Fe0.89Ru0.05Co0.06Si2, which is attributed to the different Ru solution contents in epsilon-FeSi and alpha-FeSi2+delta before the formation of beta-FeSi2 and the slow diffusion behavior of Ru during the annealing process. The Ru-alloying obviously reduces the lattice thermal conductivity via introducing the mass and strain field fluctuations to interrupt the phonon transports, while it has a weak effect on electrical transport properties. Finally, a maximum zT value of 0.33 at 900 K has been obtained for Fe0.89Ru0.05Co0.06Si2, which is about 27% higher than that for Fe0.94Co0.06Si2.
Keywordthermoelectric beta-FeSi2 Ru alloying element diffusion lattice thermal conductivity
DOI10.1021/acsami.9b10648
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26850
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Du, Xiaolong,Hu, Ping,Mao, Tao,et al. Ru Alloying Induced Enhanced Thermoelectric Performance in FeSi2-Based Compounds[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(35):32151.
APA Du, Xiaolong.,Hu, Ping.,Mao, Tao.,Song, Qingfeng.,Qiu, Pengfei.,...&Chen, Lidong.(2019).Ru Alloying Induced Enhanced Thermoelectric Performance in FeSi2-Based Compounds.ACS APPLIED MATERIALS & INTERFACES,11(35),32151.
MLA Du, Xiaolong,et al."Ru Alloying Induced Enhanced Thermoelectric Performance in FeSi2-Based Compounds".ACS APPLIED MATERIALS & INTERFACES 11.35(2019):32151.
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