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Highly tunable and temperature insensitive multilayer barium strontium titanate films

Summary: Highly tunable and temperature insensitive multilayer barium strontium
titanate films
S. Zhong and S. P. Alpaya
Materials Science and Engineering Program, University of Connecticut, Storrs, Connecticut 06269
M. W. Cole, E. Ngo, S. Hirsch, and J. D. Demaree
Weapons & Materials Research Directorate, Active Materials Research Group U.S. Army Research
Laboratory, Aberdeen Proving Ground, Maryland 21005
Received 5 January 2007; accepted 26 January 2007; published online 27 February 2007
Multilayered Ba1-xSrxTiO3 BST films were deposited on Pt coated Si substrates via metalorganic
solution deposition. The multilayer heterostructures consisted of three distinct layers of 220 nm
nominal thickness with compositions corresponding to BST 63/37, BST 78/22, and BST 88/12. At
room temperature, the heterostructure has a small-signal dielectric permittivity of 360 with a
dissipation factor of 0.012 and a dielectric tunability of 65% at 444 kV/cm. These properties
exhibited minimal dispersion as a function of temperature ranging from 90 to -10 C. These results
are explained via a thermodynamic model that incorporates electrical, mechanical, and
electromechanical interactions between BST layers. 2007 American Institute of Physics.
DOI: 10.1063/1.2710005
Due to their highly nonlinear dielectric response to an
applied electric field, ferroelectric FE materials have at-
tracted significant interest as active elements of tunable mi-


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


Collections: Materials Science