This article is cited in 4 papers

Lattice dynamics

A comparative study of the BaTiO$_3$ film and the BaTiO$_3$/(Ba$_{0.7}$Sr$_{0.3}$)TiO$_3$ superlattice using X-ray diffraction and Raman spectroscopy

O. A. Maslova^a, I. N. Zakharchenko^a, O. A. Bunina^a, Yu. I. Yuzyuk^a, N. Ortega^b, A. Kumar^b, R. S. Katiyar<sup>b

a</sup> Southern Federal University, Rostov-on-Don
^b Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, USA

Abstract: A comparative study of the BaTiO$_3$ epitaxial film and the BaTiO$_3$/(Ba$_{0.7}$Sr$_{0.3}$)TiO$_3$ 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 $\Lambda$ = 28 nm, the parameters of the unit cell averaged over the period of the superlattice $\Lambda$, 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 BaTiO$_3$ single-component film and the unit cell averaged over the period of the superlattice $\Lambda$ are pseudocubic; however, an analysis of the polarization characteristics of the Raman spectra has suggested that the film and the superlattice have monoclinic symmetry $(P_x=P_y\ne0, P_z\ne0)$. The transformation of the components of the soft mode due to the deformation of the epitaxial layers forming the superlattice has been discussed.

Received: 11.01.2012

 English version: Physics of the Solid State, 2012, 54:8, 1628–1634

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