Nanostructuring perovskite oxides

The impact of SrTiO3 nanocube 3D self-assembly on thermal conductivity

Stephen R. Yeandel, M. Molinari, Stephen C. Parker

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Nanostructuring the perovskite oxide SrTiO3via 3D assemblage of nanocubes is shown to lower the thermal conductivity over a broad range of temperatures. This is particularly valuable in thermoelectric material applications. The assemblages are composed of pristine perovskite grain interiors confined by SrO or TiO2-rich interfaces resembling Ruddlesden Popper and Magneli phases. The optimum performance in terms of the thermoelectric device applications are predicted to come from SrTiO3 nanocubes synthesised in a Sr-rich environment, although TiO2-rich nanocubes would have an increased strength. The vibrational fingerprint of the assemblages, characterized by a combination of lattice and molecular dynamics, display the characteristic modes of the perovskite structure and significant interface vibrational modes, some at very low frequency. TiO2-rich assemblages display splitting of the active modes similar to anatase providing a way to distinguish them from SrO-rich assemblages. Finally, we show that the IR active low vibrational frequencies are sensitive to the structure and stacking of the nanocubes indicating that it could be an efficient experimental route for identifying and characterizing the material with very low thermal conductivity.

Original languageEnglish
Pages (from-to)114069-114077
Number of pages9
JournalRSC Advances
Volume6
Issue number115
DOIs
Publication statusPublished - 28 Nov 2016

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Perovskite
Self assembly
Oxides
Thermal conductivity
Lattice vibrations
Vibrational spectra
Titanium dioxide
Molecular dynamics
perovskite
strontium titanium oxide
Temperature
titanium dioxide

Cite this

Yeandel, Stephen R. ; Molinari, M. ; Parker, Stephen C. / Nanostructuring perovskite oxides : The impact of SrTiO3 nanocube 3D self-assembly on thermal conductivity. In: RSC Advances. 2016 ; Vol. 6, No. 115. pp. 114069-114077.
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Nanostructuring perovskite oxides : The impact of SrTiO3 nanocube 3D self-assembly on thermal conductivity. / Yeandel, Stephen R.; Molinari, M.; Parker, Stephen C.

In: RSC Advances, Vol. 6, No. 115, 28.11.2016, p. 114069-114077.

Research output: Contribution to journalArticle

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