Abstract
PCFN-PZW ceramic systems were optimized by controlling Ca and Pb(Zn0.5W0.5)O3 contents. The resulting ceramics were modified by Pb based flux (0.85PbO-0.15PbO·WO3) addition and their microwave dielectric properties and sinterabilities were investigated as a function of the flux content and sintering temperature. In the case of 2.0wt% flux addition, the values of apparent density, dielectric constant and Q·f reached maximum, where the flux was found to be acted more effectively at the sintering temperature of 1000oC. Further addition of flux caused appearance of second phases and inferior microstructure, resulting in degraded dielectric properties. For the 2.0 wt% flux added 0.9(Pb0.4Ca0.6)(Fe0.5Nb0.5)O3-0.1Pb(Zn0.5W0.5)O3 specimen sintered at 1000oC for 4h, dielectric constant, Q·f and TCF values were 92.04, 6014 and 10.5ppm/oC, respectively.
