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Strain-induced phase transitions in epitaxial NaNbO3thin films grown by metal–organic chemical vapour deposition

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      Abstract

      Epitaxially strained NaNbO3films were grown by liquid-delivery spin metal–organic chemical vapour deposition on several oxide substrates, inducing tensile and compressive lattice strain. High-resolution X-ray diffraction measurements reveal that coherently grown compressively strained NaNbO3films on NdGaO3exhibit the orthorhombiccphase. With increasing in-plane strain a first structural phase transition to the monoclinicrphase and, further on, for films grown under tensile strain on rare earth scandates, a second phase transition to theaaphase, are observed. Our results are in good agreement with the pathway of phase transitions predicted by Diéguez, Rabe & Vanderbilt [Phys. Rev. B, (2005),72, 144101] for NaNbO3films.

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      Journal
      JACGAR
      Journal of Applied Crystallography
      J Appl Crystallogr
      International Union of Crystallography (IUCr)
      0021-8898
      October 2012
      September 2012
      : 45
      : 5
      : 1015-1023
      10.1107/S0021889812035911
      © 2012

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