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Influence of nitrogenizing and Al-doping on microstructures and thermoelectric properties of iron disilicide materials

Chen, Haiyan and Zhao, Xinbing and Zhu, T. J. and Lu, Y. F. and Ni, H. L. and Müller, Eckhard and Mrotzek, Antje (2005) Influence of nitrogenizing and Al-doping on microstructures and thermoelectric properties of iron disilicide materials. Intermetallics, 13 (7), pp. 704-709. ELSEVIER SCI LTD. ISSN 0966-9795

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_aset=V-WA-A-W-AA-MsSAYVW-UUA-U-AABEDCAVWD-AABDBBWWWD-CYDYADEEW-AA-U&_rdoc=2&_fmt=full&_udi=B6TX8-4FCSDMY-5&_coverDate=07%2F31%2F2005&_cdi=5584&_orig=search&_st=13&_sort=d&view=c&_acct=C000007338&_versio

Abstract

Aluminium doped iron disilicide based thermoelectric materials FeAl<sub>x</sub>Si<sub>2</sub> (x=0.05, 0.10) were prepared by rapid solidification, nitrogenizing treatment and hot uniaxial pressing. β-FeSi<sub>2</sub> phase with dispersed silicon have been obtained for all the hot-pressed samples after annealing at 1073 K for 20 h. The Seebeck coefficient α, electrical conductivity σ and thermal conductivity κ were measured from room temperature to 973 K. It was found that the Seebeck coefficients were markedly enhanced by the nitrogenizing treatment, but they decreased with increasing aluminium concentration x. The nitrogenizing treatment also significantly decreased the thermal conductivities of the Al-doped samples, especially for the sample with higher aluminium concentration. The maximum figure of merit of Z=1.55×10<sup>-4</sup> K<sup>-1</sup> at 743 K was obtained for FeAl<sub>0.05</sub>Si<sub>2</sub> without nitrogenizing. It is concluded that nitrogenizing treatment is promising to improve the thermoelectric properties for more heavily Al-doped FeSi<sub>2</sub>.

Item URL in elib:https://elib.dlr.de/21424/
Document Type:Article
Title:Influence of nitrogenizing and Al-doping on microstructures and thermoelectric properties of iron disilicide materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chen, HaiyanUNSPECIFIEDUNSPECIFIED
Zhao, XinbingZhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Zhu, T. J.Zhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Lu, Y. F.Zhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Ni, H. L.Zhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Mrotzek, AntjeUNSPECIFIEDUNSPECIFIED
Date:1 February 2005
Journal or Publication Title:Intermetallics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:13
Page Range:pp. 704-709
Publisher:ELSEVIER SCI LTD
ISSN:0966-9795
Status:Published
Keywords:Silicides; various; Thermoelectric properties; Rapid solidification processing
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Müller, Dr.phys. Wolf Eckhard
Deposited On:23 Jan 2006
Last Modified:27 Apr 2009 04:55

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