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Thermal Instability of β-Zn4Sb3: Insights from Transport and Structural Measurements

Dasgupta, T. and Yin, H. and de Boor, J. and Stiewe, C. and Iversen, B.B. and Müller, E. (2013) Thermal Instability of β-Zn4Sb3: Insights from Transport and Structural Measurements. Journal of Electronic Materials, 42 (7), pp. 1988-1991. Springer. DOI: 10.1007/s11664-013-2490-6 ISSN 0361-5235

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Abstract

β-Zn4Sb3 exhibits poor thermal stability, with zinc-rich specimens recently shown to be more stable. In this work, temperature-dependent transport measurements [Seebeck coefficient (S) and electrical conductivity (σ)] between room temperature (RT) and 525 K were carried out on a zinc-poor specimen. The sequentially measured S and σ data in the same measurement cycle show sharp changes in their absolute values between 450 K and 500 K during the heating cycle, which is not retraced back during cooling. A repeat measurement carried out on the specimen after ~1 month again shows the sharp changes in the absolute values between 450 K and 500 K, indicating reversibility of the process. Temperature-dependent synchrotron measurements were further carried out between RT and 525 K. Formation of elemental Sb was observed beyond 400 K. Between 450 K and 500 K, movement of zinc from lattice to interstitial position is observed, which is also accompanied by the onset of ZnSb formation. The overall zinc content within the β-Zn4Sb3 phase is observed to increase with increasing temperature. These observations indicate that both the overall zinc content and the ZnI/ZnL ratio are crucial in stabilizing the β-Zn4Sb3 phase.

Item URL in elib:https://elib.dlr.de/85752/
Document Type:Article
Title:Thermal Instability of β-Zn4Sb3: Insights from Transport and Structural Measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dasgupta, T.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Yin, H.Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus C, DenmarkUNSPECIFIED
de Boor, J.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Stiewe, C.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Iversen, B.B.Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus C, DenmarkUNSPECIFIED
Müller, E.German Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Date:22 February 2013
Journal or Publication Title:Journal of Electronic Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:42
DOI :10.1007/s11664-013-2490-6
Page Range:pp. 1988-1991
Publisher:Springer
ISSN:0361-5235
Status:Published
Keywords:Thermoelectrics transport properties Seebeck coefficient electrical conductivity synchrotron radiation diffraction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:27 Nov 2013 14:38
Last Modified:27 Nov 2013 14:38

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