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Influence of dislocations on thermal conductivity of strontium titanate

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
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Influence of dislocations on thermal conductivity of strontium titanate
Language: English
Date: 2023
Place of Publication: Darmstadt
Year of primary publication: 2020
Publisher: AIP Publishing
Journal or Publication Title: Applied Physics Letters
Volume of the journal: 117
Issue Number: 2
Collation: 5 Seiten
DOI: 10.26083/tuprints-00023224
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Origin: Secondary publication service

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.

Identification Number: 021902
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-232241
Additional Information:

Supplementary material: https://t1p.de/t6at5

Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 28 Feb 2023 10:08
Last Modified: 25 May 2023 06:14
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23224
PPN: 507933133
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