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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Roelsgaard, Martin
Aarhus University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2023Operando X-ray scattering study of segmented thermoelectric Zn$_4$Sb$_3$citations
- 2023Operando X-ray scattering study of segmented thermoelectric Zn 4 Sb 3citations
- 2023Operando X-ray scattering study of segmented thermoelectric Zn4Sb3citations
- 2021Structural evolution in thermoelectric zinc antimonide thin films studied by in situ X-ray scattering techniquescitations
- 2020Autocatalytic Formation of High-Entropy Alloy Nanoparticlescitations
- 2020Mapping the redox chemistry of common solvents in solvothermal synthesis through in situ X-ray diffractioncitations
- 2020Mapping the redox chemistry of common solvents in solvothermal synthesis through: In situ X-ray diffractioncitations
- 2020Maximizing the Catalytically Active {001} Facets on Anatase Nanoparticlescitations
- 2020Maximizing the Catalytically Active {001} Facets on Anatase Nanoparticlescitations
- 2016The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb 2 O 4citations
- 2016The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4citations
Places of action
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article
Operando X-ray scattering study of segmented thermoelectric Zn4Sb3
Abstract
<p>The inexpensive and high-performing thermoelectric material β-Zn<sub>4</sub>Sb<sub>3</sub> is a mixed ionic-electronic conductor, which suffers from stability issues due to Zn migration in the structure under thermoelectric operating conditions. Previous ex situ studies have shown that ion migration in β-Zn<sub>4</sub>Sb<sub>3</sub> and Cu<sub>2</sub>Se can be reduced in segmented modules, where ion-blocking interfaces increase the critical voltage across the module before metallic whiskers are observed at the surface. Here, we use spatially resolved operando X-ray scattering measurements across the pellet coupled with electrical resistivity measurements to examine the stability improvement obtained in segmented β-Zn<sub>4</sub>Sb<sub>3</sub> pellets with ion-blocking steel interfaces under thermoelectric operating conditions. Quantitative phase analysis shows that β-Zn<sub>4</sub>Sb<sub>3</sub> decomposes into ZnSb and Zn, but the rate is significantly reduced in segmented pellets compared with unsegmented pellets. The greatest improvement is found under the mildest conditions investigated, with a hot side temperature of 250 °C and an applied current density of 0.5 A mm<sup>−2</sup>. Microstructure analysis by scanning electron microscopy and energy dispersive X-ray spectroscopy after stability tests reveals a Zn phase front during migration, as well as residual β-Zn<sub>4</sub>Sb<sub>3</sub> islands trapped inside the decomposed ZnSb phase. Overall, the operando approach provides a dynamic atomic structure basis for the effect of segmentation on the stability of β-Zn<sub>4</sub>Sb<sub>3</sub> under thermoelectric working conditions.</p>