Processing and annealing conditions on the dielectric properties of (Ta2O5)0.92(TiO2)0.08 ceramics

Dielectric properties of (Ta2O5)(0.92) (TiO2)(0.08) polycrystalline ceramics prepared under different processing and annealing conditions are investigated at 1 MHz between - 100 and 100 degreesC. The dielectric permittivity can be significantly enhanced (up to similar to 80%) by increasing calcination time and sintering temperature. Annealing at higher temperature in air or in oxygen caused a moderate enhancement of the dielectric permittivity with only slight influence on dielectric loss. Microstructure of (Ta2O5)(0.92)(TiO2)(0.08) ceramics was studied and reported in this paper; along with the discussions on its relation with processing conditions and resulted dielectric properties. (C) 2002 Elsevier Science B.V. All rights reserved.