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| Naji, M. |
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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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| Azam, Siraj |
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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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Wang, Zhenyu
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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
- 2023Substitutional p-Type Doping in NbS2 -MoS2 Lateral Heterostructures Grown by MOCVDcitations
- 2021Super-resolved optical mapping of reactive sulfur-vacancy in 2D transition metal dichalcogenidescitations
- 2017Quasiparticle interference and strong electron-mode coupling in the quasi-one-dimensional bands of Sr<SUB>2</SUB>RuO<SUB>4</SUB>citations
- 2012A novel detection platform for parallel monitoring of DNA hybridization with high sensitivity and specificity
- 2012A novel detection platform for parallel monitoring of DNA hybridization with high sensitivity and specificity
- 2006Dielectrophoresis microsystem with integrated flow cytometers for on-line monitoring of sorting efficiencycitations
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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>