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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. (Publisher's Version)
In: Applied Physics Letters, 117 (2), AIP Publishing, ISSN 0003-6951, e-ISSN 1077-3118,
DOI: 10.26083/tuprints-00023224,

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Influence of dislocations on thermal conductivity of strontium titanate
Language: English

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.

Journal or Publication Title: Applied Physics Letters
Volume of the journal: 117
Issue Number: 2
Place of Publication: Darmstadt
Publisher: AIP Publishing
Collation: 5 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
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
DOI: 10.26083/tuprints-00023224
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-232241
Additional Information:

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

Identification Number: 021902
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23224
PPN: 507933133
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