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

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 tempera...

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Bibliographic Details
Published in:Applied physics letters 2004-08, Vol.85 (6), p.985-987
Main Authors: Sharma, A., Ban, Z.-G., Alpay, S. P., Mantese, J. V.
Format: Article
Language:eng ; jpn
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1781356