English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Using a modified Landau-Devonshire type thermodynamic potential, we show that dielectric tunability  η  of a tetragonal ferroelectric film can be analytically solved. At a given electric field  E ,  η  is a function of the remnant polarization (   $$P_0^f$$  P 0 f ) and the small-field relative dielectric permittivity (   $$\chi _0^f$$  χ 0 f ), which are commonly measured material properties. After a survey of materials, a large  η ~80% is predicted to be achievable in a (001)-oriented tetragonal (K 0.5 ,Na 0.5 )NbO 3  film. This strain-stabilized tetragonal phase is verified by density functional theory (DFT) calculations. (K 0.5 ,Na 0.5 )NbO 3  films based on this design were successfully prepared via a sputtering deposition process on SrRuO 3 -buffered (100)SrTiO 3  substrates. The resulted epitaxial films showed a sizable    $$P_0^f$$  P 0 f (~0.21C m −2 ) and a large    $$\chi _0^f$$  χ 0 f (~830–860), as well as a large  η  close to the theoretical value. The measured dielectric tunabilities as functions of  E  are well described by the theoretical  η ( E ) curves, validating our integrated approach rooted in a theoretical understanding.

Achieving a high dielectric tunability in strain-engineered tetragonal K0.5Na0.5NbO3 films