Structural, Dielectric and Electrical Properties of Modified BaTi۰.۸۰Fe۰.۲۰O۳ Ceramics by Zr Addition in Ti Site at x=۰.۰۰ to ۰.۱۰.

In this study we have synthesis the Zr substituted BaTi۰.۸۰Fe۰.۲۰O۳ ceramics at different content of Zr from x=۰.۰۰ to ۰.۱۰ 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 ≤ ۰.۰۵۰ of Zr content. While above ۰.۰۵۰ the hexagonal phase disappears in benefit of tetragonal phase. The Raman results confirmed the formation of these phases obtained with XRD. The scanning electron micrographs consist of both spherical and straight grain forms for x=۰.۰۰۰ to ۰.۰۷۵, and only spherical grain form for x=۰.۱۰۰ attributed to the tetragonal phase. Also, the grain size increases accompanied with a decrease in density of ceramics with increasing Zr content up to ۰.۰۵۰ then decreases accompanied with an increase in density. Detailed studies of dielectric permittivity measurement have provided a presence of two anomalies Te and TR-O at different temperatures, with a relaxation phenomenon and diffuse behavior which is very important for ceramic at x=۰.۰۷۵ of Zr content. The dielectric permittivity values of the two anomalies of Zr substituted BaTi۰.۸۰Fe۰.۲۰O۳ ceramics increase with increase of Zr content and the dielectric loss is minimal at x=۰.۱۰۰ of Zr content. The conductivity increases with the increasing of Zr substitution from ۰.۰۲۵ to ۰.۰۷۵ levels while for x = ۰.۱۰۰ the dielectric conductivity decreases.  And the Cole-Cole analysis indicates a negative thermal resistivity coefficient (NTCR) behavior of these materials and an ideal Debye-type behavior.

کلیدواژه ها:

Solid-state ، X-ray diffraction ، Raman ، dielectric permittivity ، anomalies ، relaxation ، diffuse ، conductivity ، Cole-Cole.