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Rapid determination of local composition in quasi-binary, inhomogeneous material systems from backscattered electron image contrast

Yasseri, Mohammad and Farahi, Nader and Kelm, Klemens and Müller, Eckhard and de Boor, Johannes (2018) Rapid determination of local composition in quasi-binary, inhomogeneous material systems from backscattered electron image contrast. Materialia. Elsevier. doi: 10.1016/j.mtla.2018.06.014. ISSN 2589-1529.

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Quantification of different phases in multiphase materials and the determination of compositions in material systems with extended solubility of the components are crucial for the engineering of material properties. In the field of thermoelectrics, multiphase materials are of considerable interest due to the additional scattering caused by different phases, reducing the lattice thermal conductivity and consequently improving the thermoelectric performance of the material. Size, shape, amount, and composition of secondary phases need to be assessed and optimized to be able to tune the material properties. SEM-EDX is the state-of-the-art method for such phase analysis. It suffers, however, from a low throughput and a limited spatial resolution. In this work, we demonstrate a simple relation between the grey value in backscattered electron images and the chemical composition allowing for a rapid method for phase quantification (with respect to composition as well as compositional fraction) in quasi-binary multiphase or wide solubility material systems. Applying this method to Mg2SixSn1−x, the Si and Sn content of each individual point on the BSE images can be calculated. The introduced SEM image analysis is much faster compared to EDX mapping as it requires only two EDX point measurements for calibration. Moreover, it also provides a superior spatial resolution.

Item URL in elib:https://elib.dlr.de/122785/
Document Type:Article
Title:Rapid determination of local composition in quasi-binary, inhomogeneous material systems from backscattered electron image contrast
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yasseri, MohammadGerman aerospace center, Institute of materials research, Köln, Germany and Justus Liebig university Giessen, Institute of inorganic and analytical chemistry, 35392 Giessen, GermanyUNSPECIFIED
Farahi, NaderGerman aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Kelm, Klemensklemens.kelm (at) dlr.deUNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany and Justus Liebig University Giessen, Institute of Inorganic and Analytical Chemistry, 35392 Giessen, GermanyUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Date:20 July 2018
Journal or Publication Title:Materialia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.mtla.2018.06.014
Keywords:Phase quantification, Quasi-binary multiphase materials, Thermoelectric, Magnesium silicide stannide, Backscattered electron image
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Systemtechnologien (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:13 Nov 2018 08:39
Last Modified:11 Jun 2021 04:13

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