The impact of tilt grain boundaries on the thermal transport in perovskite SrTiO3 layered nanostructures. A computational study

Stephen Yeandel, Marco Molinari, Stephen Parker

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Abstract

Thermal management at solid interfaces presents a technological challenge for modern thermoelectric power generation. Here, we define a computational protocol to identify nanoscale structural features that can facilitate thermal transport in technologically important nanostructured materials. We consider the
highly promising thermoelectric material, SrTiO3, where tilt grain boundaries lower thermal conductivity.
The magnitude of the reduction is shown to depend on compositional and structural arrangements at the solid interface. Quantitative analysis indicates that layered nanostructures less than 10 nm will be required to significantly reduce the thermal conductivity below the bulk value, and it will be virtually independent of temperature for films less than 2 nm depending on the orientation with a reduction of thermal transport up to 75%. At the nanoscale, the vibrational response of nanostructures shows concerted vibrations
between the grain boundary and inter-boundary regions. As the grain boundary acts markedly as a phonon quencher, we predict that any manipulation of nanostructures to further reduce thermal conductivity will be more beneficial if applied to the inter-boundary region. Our findings may be applied more
widely to benefit other technological applications where efficient thermal transport is important.
Original languageEnglish
Pages (from-to)15010-15022
Number of pages13
JournalNanoscale
Volume10
Issue number31
Early online date19 Jul 2018
DOIs
Publication statusPublished - 21 Aug 2018

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ASJC Scopus subject areas

  • Materials Science(all)

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