TITLE

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

AUTHOR(S)
Sharma, A.; Ban, Z.-G.; Alpay, S. P.; Mantese, J. V.
PUB. DATE
August 2004
SOURCE
Applied Physics Letters;8/9/2004, Vol. 85 Issue 6, p985
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The tunability of highly textured thin films of barium strontium titanate (Ba0.5Sr0.5TiO3, BST) is analyzed theoretically using a Landau–Devonshire 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.
ACCESSION #
14019771

 

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