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Dielectric and pyroelectric properties of barium strontium titanate films on orthorhombic substrates with ,,110.../ /,,100... epitaxy
 

Summary: Dielectric and pyroelectric properties of barium strontium titanate films
on orthorhombic substrates with ,,110.../ /,,100... epitaxy
G. Akcay, I. B. Misirlioglu,a
and S. P. Alpayb
Department of Materials Science and Engineering and Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269
Received 23 January 2007; accepted 9 March 2007; published online 24 May 2007
The role of anisotropic misfit strains on the spontaneous polarization, dielectric properties, and
pyroelectric response of 110 oriented Ba0.6Sr0.4TiO3 BST 60/40 thin films on 100
orthorhombic substrates is analyzed theoretically. The anisotropic in-plane strain state and the
rotation of the elastic and the electrostrictive constants of the BST 60/40 films result in strongly
directional and unique properties, different from BST 60/40 films on cubic substrates with
100 BST/ / 100 substrate epitaxy. The thermodynamic formalism also incorporates the thickness
dependence of the internal stress state due to the anisotropic relaxation of epitaxial stresses through
the formation of misfit dislocations along the two in-plane directions. In particular, the model is
applied to 110 BST 60/40 ferroelectric films on 100 NdGaO3 orthorhombic substrates. A more
generalized analysis treating the in-plane misfit strains as parameters shows that ferroelectric phases
that cannot be observed in single-crystal perovskite ferroelectrics can be stabilized due to the
reduction in the symmetry induced by the anisotropic strain state. 2007 American Institute of
Physics. DOI: 10.1063/1.2729474

  

Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut

 

Collections: Materials Science