Structural, Dielectric and Electrical Properties of Modified BaTi0.80Fe0.20O3 Ceramics by Zr Addition in Ti Site at x=0.00 to 0.10.

In this study, we have synthesized the Zr substituted BaTi0.80Fe0.20O3 ceramics at different content of Zr from x=0.00 to 0.10 by using the solid-state route. The room temperature X-ray diffraction results confirmed the coexistence of the two tetragonal and hexagonal phases for x ≤ 0.050 of Zr content. While above 0.050 the hexagonal phase disappeared in benefit of the tetragonal phase. The Raman results confirmed the formation of these phases obtained by XRD. The scanning electron micrographs consisted of both spherical and straight grain forms for x=0.000 to 0.075, and only spherical grain form for x=0.100 attributed to the tetragonal phase. Also, the grain size increased accompanied by a decrease in density of ceramics with increasing Zr content up to 0.050 then decreased accompanied by an increase in density. Detailed studies of dielectric permittivity measurement provided a presence of two anomalies Te and TR-O at different temperatures, with a relaxation phenomenon and diffuse behavior which was very important for ceramic at x=0.075 of Zr content. The dielectric permittivity values of the two anomalies of Zr substituted BaTi0.80Fe0.20O3 ceramics increased with the increase of Zr content and the dielectric loss was minimal at x=0.100 of Zr content. The conductivity increased with increasing of Zr substitution from 0.025 to 0.075 levels while for x = 0.100 the dielectric conductivity decreased. And the Cole-Cole analysis indicated a negative thermal resistivity coefficient (NTCR) behavior of these materials and ideal Debye-type behavior.