Giant dielectric constant and tunable phase-transition characteristics of ZnF2/BaF2-modified BaTiO3 thick films

Sung Hun Key, Hyo Chan Oh, Chan Su Han, Yong Soo Cho

Research output: Contribution to journalArticle

Abstract

High performance capacitors have been investigated to meet higher integration density with optimized charge-storing capability. Here, we introduce nonconventional thick film dielectric compositions based on 95BaTiO3–xZnF2–(2−x)BaF2–3glass (x = 0.5, 1.0, and 1.5) where the relative content of ZnF2/BaF2 is critical in controlling dielectric behavior. The thick films were prepared on Cu foils by regular screen-printing and then firing at 950°C in inert atmosphere. As an optimal example, thick film composition modified with 1.0ZnF2/1.0BaF2 exhibited a dielectric constant of ~1903 and a dielectric loss of ~0.04 at 1 MHz with dispersive dielectric relaxation behavior, which are far better than any reported corresponding values so far. Particularly, it was very interesting to observe that Curie temperature was tunable from −19 to +34°C, depending on the relative content of fluoride additives only within the 2 mol% range. Dependency of the relative contents of the fluorides is primarily investigated with regard to microstructure and dielectric properties.

Original languageEnglish
Pages (from-to)862-867
Number of pages6
JournalInternational Journal of Applied Ceramic Technology
Volume16
Issue number2
DOIs
Publication statusPublished - 2019 Mar 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Marketing
  • Materials Chemistry

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