Dielectric Properties of High-voltage X8R Dielectric Material with Different Kinds of Dopants

The doping effects of NiNb_2O_6,CaZrO_3 and MnCO_3 on the dielectric properties and break- down voltages of fine grain BaTiO_3 systems were studied.NiNb_2O_6 can shift the Curie temperature and broaden it,and makes contributions to double peaks;CaZrO_3 may improve the temperature coefficiency characteristic greatly and enhance the withstand voltage;adding MnCO_3 can restrain the overgrowth of particles,which can decease the dielectric dissipation and improve the withstand voltage greatly.With adding 2.5mol% NiNbO6,1.5mol% CaZrO_3 and 0.1mol% MnCO_3,a kind of MLC ceramic with low frequent and high voltage can be got,which also meets X8R requirement,and its dielectric properties are as follows:e≥2600,ΔC/C_20℃≤±15%(-55℃-+150℃),tgδ≤0.7%,E_b≥15kV/mm.