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Abstract
Crystallographic and dielectric properties of ceramics with a (1 - x)BaTiO3 + xPbF2 + xLiF composition have been investigated. Mixing, grinding and heating are performed in air atmosphere. Solubility limit of PbF2 and LiF into BaTiO3 was found near of 20 moles % (PbF2 + LiF) at 1203 K for a sintering time of 2 hours. The composition dependence of the unit cell parameters has been determined. The sintering conditions have been optimized. A relative density of more than 95% was obtained at 1273 K. Dielectric measurements have shown a ceramic with a composition corresponding to x = 0.03 exhibits a dielectric constant ϵ r ' of about 8000 at the ferroelectric Curie temperature Tc ≈ 283 K. These data associated with the low value of tan δ at Tc (≈ 1%) make this material a promising candidate for Z5U capacitor applications.