Ultrahigh anharmonicity low-permittivity tunable nanocrystalline thin-film BaTi2O5

Matthias Falmbigl, Iryna S. Golovina, Christopher J. Hawley, Aleksandr V. Plokhikh, Or Shafir, Ilya Grinberg, Jonathan E. Spanier

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Electrically tunable dielectric thin films in active circuits and systems are challenged by capacitance-induced delays and impedance matching requiring a lower dielectric constant. Here an approach to increasing the intrinsic tunability of compounds containing TiO6 octahedra by considering the influence of different connectivity among these octahedra is presented. Such connectivity variants in nanocrystalline monoclinic BaTi2O5 thin films enable a two orders of magnitude enhancement in Ti anharmonic interaction, thereby permitting a ≈65% decrease in dielectric constant to 70 at room temperature without sacrificing tunability. Edge-sharing TiO6 octahedra possess a much shorter Ti-Ti distance of only 2.91 Å as compared to the perovskite structure (~4 Å), permitting large field-induced structural re-arrangement and intrinsic tunability.

Original languageEnglish
Article number116712
JournalActa Materialia
Volume208
DOIs
StatePublished - 15 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021

Keywords

  • Atomic layer deposition
  • BaTiO thin films
  • Density functional theory
  • Dielectric properties
  • Ferroelectric
  • Tunability

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