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