Abstract: Sintering process and dielectric properties were studied by adding a small amount of different dopants into PMN ceramics using normal two-step method. When doped
with 1mol% Li₂O, the sintering temperature of PMN can be reduced to 950～1000℃. The dielectric constant and loss tangent of this material are 13500 and 0.55%
respectively, which are better than those of pure PMN. When doped with 2mol% SrO, low temperature sintering about 800～900℃ can be attained while
its loss tangent at room temperature reduced to only 0.36%. Analysis results show that the materials have good microstructures and are highly condensed. Anyhow,
doped with Li₂O and SrO can slightly lower and enhance the extent of diffuse phase transition (DPT).

Key words: Pb（Mg_1/3Nb_2/3）O₃, sintering process, doping, dielectric