用两步合成法制备了(1-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3(x=0.300.40)陶瓷，对其相结构和介电性能进行了研究. XRD分析表明，准同型相界在PT含量x=0.340.38范围内. 介电性能研究结果表明，组成在准同型相界处的试样, 其介电常数呈现最大值.同时还发现，准同型相界处的陶瓷出现介电双峰，其中一个为弛豫型?铁电相向顺电相转变的相变峰；另一个介电峰处于130150C的高温区, 可能是由镍离子变价、相结构变化等缺陷引起的松弛极化产生的.
(1-x)PNN-xPT(x=0.300.40) ceramics were prepared by a two-steps synthesis method. Phase structure and dielectric properties were studied. Morphotropic phase boundary exists in (1-x)PNN-xPT system at about x=0.340.38 composition range according to XRD analysis. Dielectric properties measurments showed that the optimum value of dielectric constant was obtained and the phenomenon of dielectric dual peaks was found for composition near the morphotropic phase boundary. One dielectric peak is phase transition peak from relaxor ferroelectric phase to paraelectric phase. The other peak lying in 130150C temperature range results from relaxational polarization of the valence change of Ni ion and kinds of defects in (1-x)PNN-xPT system.
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