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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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| 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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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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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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Yu, Yuan
RWTH Aachen University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Ostwald Ripening of Ag<sub>2</sub>Te Precipitates in Thermoelectric PbTe: Effects of Crystallography, Dislocations, and Interatomic Bondingcitations
- 2024Ostwald Ripening of Ag2Te precipitates in thermoelectric PbTe: effects of crystallography, dislocations, and interatomic bondingcitations
- 2022Defect engineering in solution-processed polycrystalline SnSe leads to high thermoelectric performancecitations
- 2022Defect engineering in solution-processed polycrystalline SnSe leads to high thermoelectric performancecitations
- 2021Sonotrodes for Ultrasonic Welding of Titanium/CFRP-Joints—Materials Selection and Design
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge 15 Te 85citations
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge<sub>15</sub>Te<sub>85</sub>citations
- 2018Unique Bond Breaking in Crystalline Phase Change Materials and the Quest for Metavalent Bondingcitations
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article
Ostwald Ripening of Ag<sub>2</sub>Te Precipitates in Thermoelectric PbTe: Effects of Crystallography, Dislocations, and Interatomic Bonding
Abstract
<jats:title>Abstract</jats:title><jats:p>Nanostructuring is important for designing thermoelectrics. Yet, nanoprecipitates are thermodynamically unstable and coarsen through Ostwald ripening. Here, the Ostwald ripening of Ag<jats:sub>2</jats:sub>Te in PbTe and its resulting impact on thermoelectric performance is investigated. Numerous Guinier‐Preston zones and platelet Ag<jats:sub>2</jats:sub>Te precipitates in the sample quenched from a single‐phase region is observed. Upon annealing, these platelet precipitates grow into big lath‐shaped second phases by consuming small Ag‐rich clusters. The crystallographic orientation relationships between Ag<jats:sub>2</jats:sub>Te and PbTe are unraveled by scanning transmission electron microscopy and modeled by first‐principles calculations. The interfaces with low lattice mismatch determine the morphology of Ag<jats:sub>2</jats:sub>Te in PbTe. Atom probe tomography reveals different chemical bonding mechanisms for PbTe and Ag<jats:sub>2</jats:sub>Te, which are metavalent and iono‐covalent, respectively. This leads to an acoustic phonon mismatch at the precipitate‐matrix interface. Yet, the electrons are also scattered by these interfaces, resulting in poor electrical properties in the as‐quenched sample. In contrast, the annealed sample contains abundant Ag‐decorated dislocations by activating the Bardeen‐Herring source. These dislocations strongly scatter phonons while maintaining a good electron transmission, contributing to a higher thermoelectric performance. This work demonstrates the complex role of microstructure morphologies, compositions, and bonding mechanisms in thermoelectric response, providing insights into structural design for thermoelectrics.</jats:p>