Dielectric and impedance properties of BaTiO3-xBi(Ni0.5Zr0.5)O3 ceramics prepared by spark plasma sintering
BaTiO3-xBi(Ni0.5Zr0.5)O3 powders were synthesized by traditional solid-state reaction method,and then BaTiO3-xBi(Ni0.5Zr0.5)O3 ceramics were prepared by spark plasma sintering.The crystal structure,micro-morphology,dielectric and impedance properties of the prepared ceramics were studied.The results show that BaTiO3-xBi(Ni0.5Zr0.5)O3 ceramics have perovskite structure and the crystal structure is pseudo-cubic phase,the grain size is about 0.64 μm,the density of the sample is 5.81 g/cm3,the maximum of the dielectric constant is 7149,and the phase transition temperature shifts to higher temperature with the increase of frequency.At 1 kHz,the slope of the fitting curve between ln(1/ε-1/εm) and ln(T-Tm) of BaTiO3-0.10Bi(Ni0.5Zr0.5)O3 ceramics is 1.61,and Δε/ε25 ℃≤±15％ at-41-169 ℃,indicating that the sample has a good temperature stability.In addition,the impedance decreases with the increase of temperature and frequency;when the frequency is 100 Hz at 50 ℃,the resistance is 2.33× 106 Ω and the ionic conductivity is 10-8 S/cm.
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