Enhanced high permittivity BaTiO3-polymer nanocomposites from the cold sintering process

The dielectric property relations of a series of BaTiO3-polymer composites with a uniquely high-volume fraction of ceramic [(1 - x)BaTiO3-x polytetrafluoroethylene (PTFE), with volume fractions x = 0.025, 0.05, 0.1, and 0.2] are studied. Such high-volume fraction of the BaTiO3 phase is achieved by using the cold sintering process, as it enables a single-step densification of oxides at an extremely low temperature; typically, the volume fractions from other processing methods are limited to ceramic filler volume fractions of ∼0.6. Microstructural and resistivity analyses suggest that the optimal range of the polymer content to effectively enhance the functions is x = 0.05, as higher volume fractions of the polymer hinder the densification of the ceramic. The composite exhibits improved properties such as lower loss tangent, higher resistivity, and high permittivity that vary systematically with x following an empirical mixing law. Here, we consider the composite mixing law trends and the changes to properties, which indicate that size effects are also being induced in the dielectric response, including shift of Tc, broadening of transition, and reduction of permittivity with respect to volume fraction of the PTFE. Our findings provide a new and simple strategy for the fabrication of ceramic-polymer composites with extremely high relative permittivities and resistivities, and these observations all point to a route that can allow us to engineer new types of advanced dielectric materials.

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Work Title Enhanced high permittivity BaTiO3-polymer nanocomposites from the cold sintering process
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Open Access
Creators
  1. Takao Sada
  2. Kosuke Tsuji
  3. Arnaud Ndayishimiye
  4. Zhongming Fan
  5. Yoshihiro Fujioka
  6. Clive A. Randall
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Journal of Applied Physics
Publication Date August 28, 2020
Publisher Identifier (DOI)
  1. https://doi.org/10.1063/5.0021040
Deposited August 02, 2022

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  • Added Sada-JAP-AR-04315-Aug2020.pdf
  • Added Creator Takao Sada
  • Added Creator Kosuke Tsuji
  • Added Creator Arnaud Ndayishimiye
  • Added Creator Zhongming Fan
  • Added Creator Yoshihiro Fujioka
  • Added Creator Clive A. Randall
  • Published
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    Work Title
    • Enhanced high permittivity BaTiO<sub>3</sub>-polymer nanocomposites from the cold sintering process
    • Enhanced high permittivity BaTiO3-polymer nanocomposites from the cold sintering process
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