Stress stabilization of a new ferroelectric phase incorporated into SrTaO2N thin films

Wenliang Zhu, Hideyuki Kamisaka, Daichi Oka, Yasushi Hirose, Andrea Leto, Tetsuya Hasegawa, Giuseppe Pezzotti

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Microstructural analyses of highly stressed SrTaO2N thin films deposited on SrTiO3 substrates by cathodoluminescence spectroscopy revealed coexistence of ferroelectric and relaxor-ferroelectric-like phases in the films. These two phases are, respectively, associated with "trans-type" and "cis-type" anion orders, as supported by the relative difference of the band gap energies calculated by first principles calculations based on the density functional theory. The formation of the new ferroelectric phase is considered to occur upon stabilization by the high compressive residual stress stored into the film structure, with the length/size of the "trans-type" region strongly depending upon the local stress state in the film.

Original languageEnglish
Article number053505
JournalJournal of Applied Physics
Volume116
Issue number5
DOIs
Publication statusPublished - 2014 Aug 7
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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