2023/12/31 by Legesse, Kebede
#Barium zirconium titanate #Impedance property #Structure #calcium oxide
paper · doi:10.20372/star.v12i4.05
Ac impedance methods are widely used for investigating the electrical behavior of materials over a wide range of frequencies and temperatures, which helps to separate the real & and imaginary components of the electrical parameters and provide a better understanding of material characteristics. (1‑x) Ba (Zr0.15Ti0.85) O3‑xCaO ceramics with the compositions of x=0.175, was prepared by solid-state reaction technique to investigate its structural and impedance properties. The sample was obtained by double sintering method from chemical-grade (99.0-99.9%) oxides and carbonate precursors such as CaO, ZrO2, BaCO3, and TiO2. The synthesized samples, (1‑x)Ba (Zr0.15Ti0.85) O3‑xCaO were characterized by an X-ray diffractometer, the density meter of Archimedes, and impedance spectroscopy. The x-ray diffraction patterns revealed that the crystal structure of the (1‑x) Ba (Zr0.15Ti0.85)O3‑xCaO was tetragonal symmetry at this particular composition with a lattice constant of a= 6.12Ao & c=7.23Ao. The real impedance decreases gradually as frequency increases and for constant temperature, as frequencies increase, the magnitude of real impedance decreases and finally shows insignificant Change. Imaginary impedance shows a peak at a frequency of 180439.55Hz. Collective analysis of structural, density, and impedance properties provides important information that the (1‑x) Ba (Zr0.15 Ti0.85)O3‑xCaO solid solution system is expected to be a promising new candidate electro ceramic material.