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Issue 6, 2018
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Chemical-bond effect on epitaxial strain in perovskite sodium niobate

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Abstract

Epitaxial films and heterostructures of perovskite oxides attract tremendous scientific interest because of the unique phenomena therein. Especially important is the epitaxial growth of films subjected to substrate-induced misfit strain. We show here that in contrast to conventional misfit-controlled epitaxy, chemical bonds determine the crystal stability and strain in epitaxial films of sodium niobate on different cubic substrates. Strain relaxation in sodium niobate is independent of misfit magnitude and proceeds through perovskite-specific tilting of oxygen octahedra in addition to common defect formation. The observed structural relaxation evidences a major role of a large internal strain that originates from chemical bonds in the perovskite cell. The effect of chemical bonds on film strain is anticipated to also control the epitaxy of other perovskite oxides and related compounds.

Graphical abstract: Chemical-bond effect on epitaxial strain in perovskite sodium niobate

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Publication details

The article was received on 18 Dec 2017, accepted on 10 Jan 2018 and first published on 11 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP08449H
Citation: Phys. Chem. Chem. Phys., 2018,20, 4263-4268
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    Chemical-bond effect on epitaxial strain in perovskite sodium niobate

    L. Yao, S. Inkinen, O. Pacherova, M. Jelinek, S. van Dijken and M. Tyunina, Phys. Chem. Chem. Phys., 2018, 20, 4263
    DOI: 10.1039/C7CP08449H

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