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New Percolative BaTiO3–Ni Composites with a High and Frequency-Independent Dielectric Constant (εr ≈ 80000)
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2001
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Frequency-independent Dielectric ConstantDielectricsEngineeringHybrid CapacitorεR ≈ 80000Novel Capacitor DevicewithSimple PowderFerroelectric ApplicationMaterials EngineeringMaterials ScienceElectrical EngineeringDielectric ConstantElectroactive MaterialMicrowave CeramicElectrical PropertyElectrochemical Double Layer CapacitorNanomaterialsEnergy CeramicApplied PhysicsFerroelectric MaterialsFunctional MaterialsElectrical Insulation
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.