Dielectric and impedance properties of BaTiO3- xBi(Ni0.5Zr0.5)O3 ceramics prepared by spark plasma sintering

Abstract

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.

Keywords

• batio3-xbi(ni0.5zr0.5)o3
• spark plasma sintering
• pseudo-cubic phase
• dielectric property
• relaxation characteristic
• impedance