New Percolative BaTiO3–Ni Composites with a High and Frequency-Independent Dielectric Constant (εr ≈ 80000)

Abstract

A novel capacitor devicewith a high, frequency‐independent dielectric constant has been fabricated by a simple powder processing route. A mixture of microparticles of ferroelectric BaTiO3 and de‐passivated metallic nickel was sintered to yield percolative composites in which the system of conducting particles separated by insulator layers (see Figure for an SEM image) exhibits a dielectric constant higher than that of either component.

Faradaic current in different mullite materials: single crystal, ceramic and cermets

“…Finally, it should be noted that as it has been shown for BaTiO 3 /Ni composites, which behaves in a similar way as the Mullite/Molybdenum [6,11,12] ones, the electric field can be increased even by a factor of 10 4 by the effect of metallic inclusions, especially for concentrations very close to the percolation threshold.…”

Testing the Tube Super-Dielectric Material Hypothesis: Increased Energy Density Using NaCl

“…And what is the roll of salt? Other models of high dielectric values include the impact of metal particles [36][37][38] and the impact of creating a dielectric material at the percolation limit. [39][40][41] There are no metal particles in the T-SDM, and there is no reason to believe that there is some phase in the T-SDM near a percolation limit.…”

Comportamiento dieléctrico de La_1-xCa_xMnO₃ (0.4 ≤ x ≤ 0.5)

“…Very high values are observed at low frequencies for all the prepared manganites. In fact, values as high as 1·10 4 are reached for LC50. At higher frequencies tanδ exponentially decreases up to reach values ranged between 2 and 10.…”