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The role of thermally-induced internal stresses on the tunability of textured barium strontium titanate films
 

Summary: The role of thermally-induced internal stresses on the tunability
of textured barium strontium titanate films
A. Sharma, Z.-G. Ban, and S. P. Alpaya)
Department of Metallurgy and Materials Engineering and Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269
J. V. Mantese
Delphi Research Laboratories, Shelby Township, Michigan 48315
(Received 29 March 2004; accepted 11 June 2004)
The tunability of highly textured thin films of barium strontium titanate (Ba0.5Sr0.5TiO3, BST) is
analyzed theoretically using a Landau­Devonshire thermodynamic model. The relative dielectric
constant of BST films is determined as functions of the applied external electric field, deposition
temperature, and the thermal expansion coefficient of the substrate. Our analysis shows that
tunability is highly dependent upon thermally induced strains within the material. Both tension and
compression produce deleterious tuning response. However, this effect can be minimized through
judicious choices of deposition temperature and appropriate substrate material. © 2004 American
Institute of Physics. [DOI: 10.1063/1.1781356]
In recent years much attention has been given to the
development of tunable dielectric materials for voltage con-
trolled phase shifters.1,2
Such devices could have extensive

  

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

 

Collections: Materials Science