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Influence of Pre-annealing on the Microstructure and Thermoelectric Properties of Mn + Al Doped Iron Disilicide Prepared by Rapid Solidification and Hotpressing

Chen, Haiyan and Zhao, XinBing and He, Zeming and Stiewe, Christian and Müller, Eckhard (2006) Influence of Pre-annealing on the Microstructure and Thermoelectric Properties of Mn + Al Doped Iron Disilicide Prepared by Rapid Solidification and Hotpressing. In: Proceedings of the 25th International Conference on Thermoelectrics, pp. 670-673. IEEE, Piscataway. 25th International Conference on Thermoelectrics, 6.-10. August 2006, Vienna, Austria. ISBN 1-4244-0811-3 ISSN 1094-2734

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Abstract

Iron disilicide based thermoelectric materials with the designed composition Fe1-xMnxAlySi2-y (x=0.06, 0.08; y=0, 0.02, 0.04) were prepared by rapid solidification and hot pressing (1193K, 100 MPa, 30 minutes). The effects of Mn+Al double doping were investigated. The influence of pre-annealing on the microstructure and the transport properties were also studied. X-ray diffraction and scanning electron microscopy show that after pre-annealing at 800°C for only 10 hours, the high temperature phases (α-Fe2Si5 and ε-FeSi) in the rapidly solidified powders Fe1-xMnxAlySi2-y have been completely transformed to β-FeSi2 phase for y=0 and y=0.02. It is found that the grain growth during hot pressing was suppressed for the pre-annealed samples. For the pressed compacts, the Seebeck coefficient was markedly enhanced by the pre-annealing treatment, while both the electrical conductivity and the thermal conductivity were decreased. Mn+Al double doping improves the electrical conductivity, but deteriorates the Seebeck coefficient and the thermal conductivity. The maximum of the figure of merit (ZT = 0.20) is obtained at 890 K for the sample double doped with y=0.04 (Fe0.94Mn0.06Al0.02Si1.98) that is hot pressed from pre-annealed powders.

Item URL in elib:https://elib.dlr.de/45932/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Influence of Pre-annealing on the Microstructure and Thermoelectric Properties of Mn + Al Doped Iron Disilicide Prepared by Rapid Solidification and Hotpressing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chen, HaiyanUNSPECIFIEDUNSPECIFIED
Zhao, XinBingZhejiang University, Hangzhou, PR ChinaUNSPECIFIED
He, ZemingUNSPECIFIEDUNSPECIFIED
Stiewe, ChristianUNSPECIFIEDUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Date:6 August 2006
Journal or Publication Title:Proceedings of the 25th International Conference on Thermoelectrics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 670-673
Editors:
EditorsEmail
Rogl, PeterUNSPECIFIED
Publisher:IEEE, Piscataway
ISSN:1094-2734
ISBN:1-4244-0811-3
Status:Published
Keywords:thermoelectric materials, iron disilicide, doping
Event Title:25th International Conference on Thermoelectrics
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:6.-10. August 2006
Organizer:Universität Wien
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: Stiewe, Dr.rer.nat Christian
Deposited On:08 Jan 2007
Last Modified:27 Apr 2009 13:17

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