The structure of a new nano-phase of lanthanum-doped strontium titanate

Ercin C. Duran; Alexander S. Eggeman

doi:10.1016/j.jssc.2020.121795

The structure of a new nano-phase of lanthanum-doped strontium titanate

Ercin C. Duran, Alexander S. Eggeman^*

^*Corresponding author for this work

University of Manchester

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

A novel ordered phase in La-doped SrTiO₃ was determined through three-dimensional electron diffraction studies. An overall stoichiometry of LaSr₇Ti₈O₂₃ leads to a monoclinic structure with layers of square pyramids of TiO₅ localised near the lanthanum substituted positions. The difference in crystal structure of the nanoprecipitates, particularly the connection of the rigid Ti–O frameworks, should affect the phonon interactions in the bulk material and so helps to explain a decrease in the lattice thermal conductivity in the La-doped SrTiO₃, which is beneficial towards desired thermoelectric properties.

Original language	English
Article number	121795
Journal	Journal of Solid State Chemistry
Volume	293
DOIs	https://doi.org/10.1016/j.jssc.2020.121795
Publication status	Published - Jan 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 The Authors

Funding

The authors would like to acknowledge financial support from The Royal Society and the EPSRC through grant number EP / S021531 /1 . Ercin C. Duran would also like to acknowledge financial support from The Ministry of National Education of Republic of Turkey . The authors thank Dr Feridoon Azough for supplying the materials and discussion and comments around the research.

Funders	Funder number
Ministry of National Education of Republic of Turkey
Engineering and Physical Sciences Research Council	EP / S021531 /1
Royal Society

Keywords

Precession electron diffraction
Structure determination
Thermoelectrics

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10.1016/j.jssc.2020.121795

Cite this

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abstract = "A novel ordered phase in La-doped SrTiO3 was determined through three-dimensional electron diffraction studies. An overall stoichiometry of LaSr7Ti8O23 leads to a monoclinic structure with layers of square pyramids of TiO5 localised near the lanthanum substituted positions. The difference in crystal structure of the nanoprecipitates, particularly the connection of the rigid Ti–O frameworks, should affect the phonon interactions in the bulk material and so helps to explain a decrease in the lattice thermal conductivity in the La-doped SrTiO3, which is beneficial towards desired thermoelectric properties.",

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AB - A novel ordered phase in La-doped SrTiO3 was determined through three-dimensional electron diffraction studies. An overall stoichiometry of LaSr7Ti8O23 leads to a monoclinic structure with layers of square pyramids of TiO5 localised near the lanthanum substituted positions. The difference in crystal structure of the nanoprecipitates, particularly the connection of the rigid Ti–O frameworks, should affect the phonon interactions in the bulk material and so helps to explain a decrease in the lattice thermal conductivity in the La-doped SrTiO3, which is beneficial towards desired thermoelectric properties.

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KW - Thermoelectrics

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The structure of a new nano-phase of lanthanum-doped strontium titanate

Abstract

Bibliographical note

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Keywords

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