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High-temperature thermoelectric properties of the compound CaAl2Si2 and effects of substitution and doping

Möller, Matthias Edgar and de Boor , Johannes and Müller , Eckhard and Albert, Barbara (2013) High-temperature thermoelectric properties of the compound CaAl2Si2 and effects of substitution and doping. 32nd International Conference on Thermoelectrics, June 30.-July 04. 2013, Kobe, Japan.

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Abstract

Zintl phases are promising thermoelectric materials especially because of their so-called ‘electron crystal, phonon glass’ behaviour[1]. This work focuses on high temperature thermoelectric properties of the ternary 1-2-2 Zintl phases Ca1-xAxAl2-yMySi2 (A = Sr, Ba; M = Zn, Mn)[2]. Compounds with the CaAl2Si2 structure type are known to be interesting thermoelectric materials, an example is CaZn2Sb2 [3]. Low-temperature measurements (10-300 K) of the thermoelectric properties for CaAl2Si2 were recently described[4]. We were interested in the thermoelectric potential of compounds with the general composition Ca1-xAxAl2-yMySi2. Synthesis of the materials was done via arc melting technique. The samples were characterized, densified (hot pressing, SPS) and investigated with respect to their thermoelectric properties (compare [5]). Characterization methods include X-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Furthermore high temperature thermal analysis, Seebeck, electrical and thermal conductivity measurements were done. The results will be discussed as well as the influence of the compositional variation of x and y. While substitution with an alkaline earth metal should reduce the thermal conductivity, doping aluminium with zinc or manganese should have an effect on the electrical properties of the material since the conductivity is present mainly in the Al2Si2 layers. [1] G. A. Slack, in CRC Handbook of Thermoelectrics, ed. D. M. Rowe, CRC Press, New York, 1995, 407-440. [2] C. Kranenberg, D. Johrendt, A. Mewis, Z. Anorg. Allg. Chem. 1999, 625, 1787. [3] E. S. Toberer, A. F. May, B. C. Melot, E. Flage-Larsen, G. J. Snyder, Dalton Trans. 2010, 39, 1046. [4] Y. K. Kuo, K. M. Sivakumar, J. I. Tasi, C. S. Lue, J. W. Huang, S. Y. Wang, D. Varshney, N. Kaurav, R. K. Singh, J. Phys.: Condens. Matter 2007, 19, 176206. [5] M. Möller, G. Cordier, K. Hofmann, B. Albert, Z. Anorg. Allg. Chem. 2012, 638, 1637.

Item URL in elib:https://elib.dlr.de/86024/
Document Type:Conference or Workshop Item (Speech)
Title:High-temperature thermoelectric properties of the compound CaAl2Si2 and effects of substitution and doping
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Möller, Matthias EdgarTechnical University Darmstadt, Anorganic Solid State Chemistry, Alarich-Weiss-Str. 12, 64287 Darmstadt, GermanyUNSPECIFIED
de Boor , JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Müller , EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany and Institute for Inorganic and Analytical Chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, GermanyUNSPECIFIED
Albert, BarbaraTechnical University Darmstadt, Anorganic Solid State Chemistry, Alarich-Weiss-Str. 12, 64287 Darmstadt, GermanyUNSPECIFIED
Date:1 July 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Zintl Compounds, high-temperature thermoelectric properties
Event Title:32nd International Conference on Thermoelectrics
Event Location:Kobe, Japan
Event Type:international Conference
Event Dates:June 30.-July 04. 2013
Organizer:ITS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Fahrzeugenergiesysteme III (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:02 Dec 2013 07:06
Last Modified:08 May 2014 23:26

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