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Thermoelectric properties of Mn doped FeSi<sub>x</sub> alloys hot pressed from nitrified rapidly solidified powders

Zhao, Xinbing and Chen, Haiyan and Müller, Eckhard and Drasar, Cestmir (2005) Thermoelectric properties of Mn doped FeSi<sub>x</sub> alloys hot pressed from nitrified rapidly solidified powders. Applied Physics A: Materials Science & Processing, 80 (5), pp. 1123-1127. Springer-Verlag GmbH. DOI: 10.1007/s00339-004-2596-z ISSN 0947-8396

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Official URL: http://www.springerlink.com/media/5f8rvjqwtp5r73w3dbe7/contributions/k/p/a/8/kpa8prm0b5metmnj.pdf

Abstract

Manganese doped FeSi<sub>x</sub> alloys (x=1.9, 2.0, 2.1, 2.3 and 2.5) with fine grain sizes of about a few micrometers and densifications over 99% have been prepared by vacuum hot-pressing at 975 °C/30 min and annealing at 800 °C/20 h from rapidly solidified powders. In addition to β-FeSi<sub>2</sub>, a silicon phase was found in the samples in the form of rods of 200 nm in diameter as x>2 and also polyhedrons of several microns in size as x=2.5. Transport property measurements revealed that excess silicon decreases the Seebeck coefficient and the electric conductivity, but increases the thermal conductivity of the β-FeSi<sub>2</sub> based alloys, due to the high thermal but low electric conductivity of the silicon particles. A high figure of merit of 2.0×10<sup>-4</sup> K<sup>-1</sup> was obtained for the sample with x=2 at 600 °C. Low thermal conductivity of about 4 W(mK)<sup>-1</sup> between 400 °C and 800 °C for the samples without excess silicon suggests that some dispersed fine nitrides form during the preparation of the samples, which enhance the phonon scattering and reduce the thermal conductivity of the materials.

Item URL in elib:https://elib.dlr.de/21430/
Document Type:Article
Title:Thermoelectric properties of Mn doped FeSi<sub>x</sub> alloys hot pressed from nitrified rapidly solidified powders
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zhao, XinbingZhejiang University, Hangzhou, PR ChinaUNSPECIFIED
Chen, HaiyanUNSPECIFIEDUNSPECIFIED
Müller, EckhardUNSPECIFIEDUNSPECIFIED
Drasar, CestmirUniv. Pardubice, CZUNSPECIFIED
Date:February 2005
Journal or Publication Title:Applied Physics A: Materials Science & Processing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:80
DOI :10.1007/s00339-004-2596-z
Page Range:pp. 1123-1127
Publisher:Springer-Verlag GmbH
ISSN:0947-8396
Status:Published
Keywords:Silicides, Thermoelectric properties, Rapid solidification processing, densification, thermal conductivity
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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