Chemical-bond effect on epitaxial strain in perovskite sodium niobate

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Czech Academy of Sciences
  • University of Oulu

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.

Details

Original languageEnglish
Pages (from-to)4263-4268
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number6
Publication statusPublished - 1 Jan 2018
MoE publication typeA1 Journal article-refereed

ID: 29204073