Hot sputtering of barium strontium titanate on nickel foils

Seymen M. Aygün, Patrick Daniels, William Borland, Jon-Paul Maria

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The relationships linking temperature and voltage dependent dielectric response, grain size, and thermal budget during synthesis are illustrated. In doing so, it was found that maximizing thermal budgets within experimental bounds leads to electrical properties comparable to the best literature reports irrespective of the processing technique or microstructure. The optimal film properties include a bulk transition temperature, a room temperature permittivity of 1800, a voltage tuning ratio of 10:1 at 450 kV/cm, and a loss tangent less than 1.5% at 450 kV/cm. The sample set illustrates the well-known relationship between permittivity and crystal dimension, and the onset of a transition temperature shifts at very fine grain sizes. A brick wall model incorporating a high permittivity grain and a low permittivity grain boundary is used to interpret the dielectric data. However, the data show that high permittivity and tunability values can be achieved at grain sizes or film thicknesses that many reports associate with dramatic reductions in the dielectric response. These differences are discussed in terms of crystal quality and maximum processing temperature. The results collectively suggest that scaling effects in ferroelectric thin films are in many cases the result of low thermal budgets and the consequently high degree of structural imperfection and are not from the existence of low permittivity phases at the dielectric-electrode interface.

Original languageEnglish (US)
Article number084123
JournalJournal of Applied Physics
Volume103
Issue number8
DOIs
StatePublished - May 9 2008

Fingerprint

strontium
barium
foils
sputtering
nickel
permittivity
budgets
grain size
transition temperature
bricks
electric potential
tangents
crystals
film thickness
grain boundaries
electrical properties
tuning
scaling
microstructure
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Aygün, Seymen M. ; Daniels, Patrick ; Borland, William ; Maria, Jon-Paul. / Hot sputtering of barium strontium titanate on nickel foils. In: Journal of Applied Physics. 2008 ; Vol. 103, No. 8.
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Hot sputtering of barium strontium titanate on nickel foils. / Aygün, Seymen M.; Daniels, Patrick; Borland, William; Maria, Jon-Paul.

In: Journal of Applied Physics, Vol. 103, No. 8, 084123, 09.05.2008.

Research output: Contribution to journalArticle

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