Effect of NiO on Microstructure and Properties of PMN-PT-BT Ceramics Prepared by Mixed Oxide Method

Abstract

Effects of NiO were studied in aspects of dielectric properties and microstructure of 0.96(0.91Pb(Mg1/3Nb2/3)O3-0.09PbTiO3)-0.04BaTiO3 (PMN-PT-BT, PBT). The PBT was prepared by a conventional mixed oxide method using (MgCO3)4Mg(OH)2 instead of MgO through Lewis acid-base interaction. NiO was added in the range of 0.5 to 3.0 wt% as thermally decomposable 2NiCO33Ni(OH)2 and it seemed to enhance densification to a large extent below 1000℃. But all the systems gave rise to ceramics with almost same relative sintered density of 96% by sintering at 1000℃ for 2 h. But it turned out that the addition of NiO was detrimental to dielectric constant but beneficial to the loss of dielectric constant.