Johanning, Melanie ; Porz, Lukas ; Dong, Jinfeng ; Nakamura, Atsutomo ; Li, Jing-Feng ; Rödel, Jürgen (2023)
Influence of dislocations on thermal conductivity of strontium titanate.
In: Applied Physics Letters, 2020, 117 (2)
doi: 10.26083/tuprints-00023224
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
Recently, several creative processing techniques yielded thermoelectrics with reduced thermal conductivity and, thereby, an enhanced figure or merit. These were based on engineered complex microstructures with attendant dislocation structures. In this study, we implement highly controlled mesoscopic dislocation structures into the model thermoelectric SrTiO₃ in order to quantify phonon scattering at dislocations. Both single crystals and polycrystalline material have been furnished with enhanced dislocation densities increased by a factor of 150–300 by plastic deformation. Thermal conductivity was measured using laser flash analysis between room temperature and 325 °C. Etch pit techniques and ultra-high voltage electron microscopy afford quantification of dislocation density. Experimental results were compared to predictions by the Debye-Callaway model. The latter revealed that dislocation densities of 10¹⁵ m⁻² would be necessary for the reduction of thermal conductivity of SrTiO₃ in the investigated temperature range, which could not be realized using the plastic deformation mechanism applied.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Johanning, Melanie ; Porz, Lukas ; Dong, Jinfeng ; Nakamura, Atsutomo ; Li, Jing-Feng ; Rödel, Jürgen |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Influence of dislocations on thermal conductivity of strontium titanate |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2020 |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 117 |
| (Heft-)Nummer: | 2 |
| Kollation: | 5 Seiten |
| DOI: | 10.26083/tuprints-00023224 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23224 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Recently, several creative processing techniques yielded thermoelectrics with reduced thermal conductivity and, thereby, an enhanced figure or merit. These were based on engineered complex microstructures with attendant dislocation structures. In this study, we implement highly controlled mesoscopic dislocation structures into the model thermoelectric SrTiO₃ in order to quantify phonon scattering at dislocations. Both single crystals and polycrystalline material have been furnished with enhanced dislocation densities increased by a factor of 150–300 by plastic deformation. Thermal conductivity was measured using laser flash analysis between room temperature and 325 °C. Etch pit techniques and ultra-high voltage electron microscopy afford quantification of dislocation density. Experimental results were compared to predictions by the Debye-Callaway model. The latter revealed that dislocation densities of 10¹⁵ m⁻² would be necessary for the reduction of thermal conductivity of SrTiO₃ in the investigated temperature range, which could not be realized using the plastic deformation mechanism applied. |
| ID-Nummer: | 021902 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-232241 |
| Zusätzliche Informationen: | Supplementary material: https://t1p.de/t6at5 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe |
| Hinterlegungsdatum: | 28 Feb 2023 10:08 |
| Letzte Änderung: | 01 Mär 2023 06:13 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Influence of dislocations on thermal conductivity of strontium titanate. (deposited 28 Feb 2023 10:08) [Gegenwärtig angezeigt]
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