Journal of the American Ceramic Society · 2003 · 44 citations · 8 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMaterials CharacterizationDielectric CeramicsDielectricsElectrical Properties Of CeramicsFerroelectric CeramicsSinteringBarium TitanateBarium Titanate CeramicsCeramic CapacitorsCeramic DielectricsCeramic PowdersDielectric ConstantSintered DensitySintering Behavior
Different amounts of silver (0.5–10 wt%) have been mixed with EIA X7R‐type ceramic powders based on barium titanate. The XRD analysis indicated that no phases other than BaTiO 3 and silver were present in the doped ceramics; it further suggested that no reaction took place between BaTiO 3 and silver during calcination and sintering. SEM observation showed that the silver particles presented island distribution in the BaTiO 3 ceramic matrix. The densification and dielectric properties of the silver‐doped ceramics in disk form were investigated. A large amount of silver addition (>1 wt%) was found to improve the sintered density and dielectric properties. The temperature coefficient of capacitors of the ceramics doped with 10 wt% silver still met the X7R characteristics, and the dielectric constant of the ceramics at room temperature was >6000, which is the highest dielectric constant in the BaTiO 3 ‐based X7R system.
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