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.
| Original language | English |
|---|---|
| Pages (from-to) | 4263-4268 |
| Number of pages | 6 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 20 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1 Jan 2018 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors acknowledge support from the Academy of Finland (Grant No. 293929 and 304291), the European Research Council (ERC-2012-StG 307502), the Grant Agency of the Czech Republic (Grant No. 15-15123S) and Infotech Oulu of the University of Oulu. TEM analysis was conducted at the Aalto University OtaNano – Nanomicroscopy Center (Aalto-NMC).
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Seitsonen, J. (Manager) & Rissanen, A. (Other)
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