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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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Wuttig, Matthias
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (39/39 displayed)
- 2024Ostwald Ripening of Ag<sub>2</sub>Te Precipitates in Thermoelectric PbTe: Effects of Crystallography, Dislocations, and Interatomic Bondingcitations
- 2024Metavalent or Hypervalent Bonding:Is There a Chance for Reconciliation?citations
- 2024Ostwald Ripening of Ag2Te precipitates in thermoelectric PbTe: effects of crystallography, dislocations, and interatomic bondingcitations
- 2024Metavalent or Hypervalent Bondingcitations
- 2023A Quantitative Investigation of Functionalized Glazing Stacks by Atom Probe Tomographycitations
- 2023Amorphous and highly nonstoichiometric titania (TiOx) thin films close to metal-like conductivity
- 2023Metavalent or Hypervalent Bonding: Is There a Chance for Reconciliation?citations
- 2022Scaling and Confinement in Ultrathin Chalcogenide Films as Exemplified by GeTecitations
- 2022Nanostructured In3SbTe2 antennas enable switching from sharp dielectric to broad plasmonic resonances
- 2022Halide Perovskites: Advanced Photovoltaic Materials Empowered by a Unique Bonding Mechanismcitations
- 2022Nanostructured In<sub>3</sub>SbTe<sub>2</sub> antennas enable switching from sharp dielectric to broad plasmonic resonancescitations
- 2022The glass transition of water, insight from phase change materialscitations
- 2022Nanostructured In 3 SbTe 2 antennas enable switching from sharp dielectric to broad plasmonic resonancescitations
- 2022Fragile-to-Strong Transition in Phase-Change Material Ge 3 Sb 6 Te 5citations
- 2021Phase Change Memory Materials by Design
- 2021Metavalent Bonding in Phase Change Materials:Provocation or Promise?
- 2021Combining switchable phase‐change materials and phase‐transition materials for thermally regulated smart mid‐infrared modulatorscitations
- 2021The potential of chemical bonding to design crystallization and vitrification kineticscitations
- 2021Halide Perovskites: Advanced Photovoltaic Materials Empowered by a Unique Bonding Mechanism
- 2021Metavalent Bonding in Solids: Provocation or Promise?
- 2021Non-volatile photonic Applications with Phase Change Materials
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge 15 Te 85citations
- 2021Metavalent Bonding in Crystalline Solids: How Does It Collapse?citations
- 2021Metavalent Bonding in Crystalline Solids: How Does It Collapse?citations
- 2021Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge<sub>15</sub>Te<sub>85</sub>citations
- 2020Violation of the Stokes–Einstein relation in Ge2Sb2Te5, GeTe, Ag4In3Sb67Te26, and Ge15Sb85, and its connection to fast crystallizationcitations
- 2020Changes of structure and bonding with thickness in chalcogenide thin filmscitations
- 2019Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge 2 Sb 2 Te 5citations
- 2019Role of grain boundaries in Ge–Sb–Te based chalcogenide superlatticescitations
- 2019Persistence of spin memory in a crystalline, insulating phase-change materialcitations
- 2018Unique Bond Breaking in Crystalline Phase Change Materials and the Quest for Metavalent Bondingcitations
- 2018Atomic disordering processes in crystalline GeTe induced by ion irradiationcitations
- 2017Formation of resonant bonding during growth of ultrathin GeTe filmscitations
- 2016Interband characterization and electronic transport control of nanoscaled GeTe/Sb2Te3 superlatticescitations
- 2016Ordered Peierls distortion prevented at growth onset of GeTe ultra-thin filmscitations
- 2014Amorphous and highly nonstoichiometric titania (TiOx) thin films close to metal-like conductivitycitations
- 2012Role of vacancies in metal-insulator transitions of crystalline phase-change materialscitations
- 2011The influence of a temperature dependent band gap on the energy scale of modulated photocurrent experimentscitations
- 2008Investigation of SnSe, SnSe2, and Sn2Se3 alloys for phase change memory applicationscitations
Places of action
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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>