Conditions Extrêmes et Matériaux : Haute Température et Irradiation
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2012

ACL
doi

O.Maslova, I.N.Zakharchenko, O.A.Bunina, Y.I.Yuzyuk, N.Ortega, A.Kumar, R.S.Katiyar, 'A comparative study of the BaTiO3 film and the BaTiO3/(Ba0.7Sr0.3)TiO3 superlattice using X-ray diffraction and raman spectroscopy', Phys. Solid State 54 1628-1634 (2012) doi:10.1134/s1063783412080203

A comparative study of the BaTiO3 epitaxial film and the BaTiO3/(Ba0.7Sr0.3)TiO3 superlattice prepared by pulsed laser deposition on MgO(100) substrates has been performed. The complete parallel orientation of the film and the substrate has been established and the modulation period of the superlattice I > = 28 nm, the parameters of the unit cell averaged over the period of the superlattice I >, and the unit cell parameters of the layers forming the superlattice have been determined using the X-ray diffractometry data. According to the X-ray diffraction data, the unit cell of the BaTiO3 single-component film and the unit cell averaged over the period of the superlattice I > are pseudocubic; however, an analysis of the polarization characteristics of the Raman spectra has suggested that the film and the superlattice have monoclinic symmetry (P (x) = P (y) not equal 0, P (z) not equal 0). The transformation of the components of the soft mode due to the deformation of the epitaxial layers forming the superlattice has been discussed.