Abstract
AbstractMonovalent ion (MOI) doping effect on the grain size and giant dielectric constant (ϵ ′ ∼ 104) of lead free environment friendly NiO‐based Kx Ti0.02Ni0.98–x O (KTNO, x = 0.04, 0.25, and 0.30) type ceramics have been investigated. Increasing K concentration (MOI) enhances the grain size along with the increase of ϵ ′ values. The dielectric constant of KTNO also increases with increase of the sintering time and temperature (within the range of our measurement) due to enhancement of crystalline size. The giant ϵ ′ value and the leakage current in KTNO show weak field dependent behavior. Estimated temperature coefficient of permittivity (TCP) of KTNO is very low (less than 6%). All these properties meet the requirements of the ceramics used in X7R EIA specification. High ϵ ′ in KTNO is attributed to the boundary layer mechanism. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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