title: Dramatically enhanced non-Ohmic properties and maximum stored energy density in ceramic-metal nanocomposites: CaCu3Ti4O12/Au nanoparticles.
abstract: Non-Ohmic and dielectric properties of a novel CaCu3Ti4O12/Au nanocomposite were investigated. Introduction of 2.5 vol.% Au nanoparticles in CaCu3Ti4O12 ceramics significantly reduced the loss tangent while its dielectric permittivity remained unchanged. The non-Ohmic properties of CaCu3Ti4O12/Au (2.5 vol.%) were dramatically improved. A nonlinear coefficient of ≈ 17.7 and breakdown electric field strength of 1.25 × 104 V/m were observed. The maximum stored energy density was found to be 25.8 kJ/m3, which is higher than that of pure CaCu3Ti4O12 by a factor of 8. Au addition at higher concentrations resulted in degradation of dielectric and non-Ohmic properties, which is described well by percolation theory.
authors.forename: Wattana
authors.initials: W
authors.lastname: Tuichai
authors.forename: Saowalak
authors.initials: S
authors.lastname: Somjid
authors.forename: Bundit
authors.initials: B
authors.lastname: Putasaeng
authors.forename: Teerapon
authors.initials: T
authors.lastname: Yamwong
authors.affiliation: Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. apiwat@kku.ac.th.
authors.forename: Apiwat
authors.initials: A
authors.lastname: Chompoosor
authors.forename: Prasit
authors.initials: P
authors.lastname: Thongbai
authors.forename: Vittaya
authors.initials: V
authors.lastname: Amornkitbamrung
authors.forename: Santi
authors.initials: S
authors.lastname: Maensiri