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Dielectric tunability of ,,110... oriented barium strontium titanate epitaxial films on ,,100... orthorhombic substrates
 

Summary: Dielectric tunability of ,,110... oriented barium strontium titanate epitaxial
films on ,,100... orthorhombic substrates
G. Akcay, I. B. Misirlioglu, and S. P. Alpaya
Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269
and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
Received 24 April 2006; accepted 1 June 2006; published online 25 July 2006
We develop a thermodynamic model to determine the polarization, dielectric permittivity, and
tunability of epitaxial ferroelectric films on orthorhombic substrates. In particular, we study the film
thickness dependence of the tunability in epitaxial 110 Ba0.6Sr0.4TiO3 films on 001 NdGaO3
substrates. The analysis takes into account 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. We predict significant improvement in the tunability along both in-plane
and out-of-plane directions of Ba0.6Sr0.4TiO3 films with increasing film thickness compared to the
similar films on cubic substrates. 2006 American Institute of Physics. DOI: 10.1063/1.2234839
In recent years, much attention has been devoted to the
development of tunable dielectric materials for voltage-
controlled, frequency-agile phase shifters and filters operat-
ing in the microwave regime. Ferroelectric FE materials
such as barium strontium titanate Ba1-xSrxTiO3 BST have
emerged as leading candidates for such applications due to

  

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

 

Collections: Materials Science