Processing and Dielectric Properties of (pb,bi)(mg,nb,ti)o3 Ceramics

Powders of the Pb(Mg1/3Nb2/3)O3–Bi(Mg2/3Nb1/3)O3 (PMN–BMN) system with PbTiO3 (PT) substitution levels of 20 and 30mol% were prepared by a B-site precursor method. Phase development as well as dielectric properties were examined. Two major phases, i.e., MgNb2O6 and [(Mg1/3Nb2/3)1/2Ti1/2]O2 (with small fractions of Mg4Nb2O9), developed in the B-site precursor compositions, whereas only monophasic perovskite formed after the addition of PbO/Bi2O3. Maximum dielectric constant values of the two systems decreased rapidly with increasing BMN concentration, but corresponding temperatures were lowest at intermediate compositions.