Abstract
Effects of NiO were studied in aspects of dielectric properties and microstructure of 0.96(0.91Pb(Mg 1/3 Nb 2/3 )O₃-0.09PbTiO₃)-0.04BaTiO₃ (PMN-PT-BT, PBT). The PBT was prepared by a conventional mixed oxide method using (MgCO₃)₄·Mg(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 2NiCO₃·3Ni(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.
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