Structural and dielectric properties of Ba0.95Bi0.05Ti1-xFexO3ceramics at x=0.0, 0.1 and 0.2 prepared by solid state method

Abstract

<p><span lang="EN-US">The Ba<sub>0.95</sub>Bi<sub>0.05</sub>Ti<sub>1-x</sub>Fe<sub>x</sub>O<sub>3 </sub>ceramics at (x=0.0, 0.1 and 0.2) were prepared by the solid-state reaction method. The effect of iron substitution on structural and dielectric properties of Ba<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> ceramic was studied. These compounds are found to crystallize in only tetragonal phase for x = 0.0 and 0.1 and the mixture of tetragonal and hexagonal phases for x = 0.2. The dielectric properties of Ba<sub>0.95</sub>Bi<sub>0.05</sub>Ti<sub>1-x</sub>Fe<sub>x</sub>O<sub>3</sub> ceramics at x=0.0, 0.1 and 0.2 of Fe -doping concentration. The dielectric measurements as a function of temperature and frequency are studied and showed two diffuse phase transition and relaxation phenomena. The evolution of dielectric permittivity as a function of the frequency of undoped Ba<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> show a relaxation phenomenon for which is displaced to the higher frequencies accompanied by a decrease in dielectric constant when x increase. The Complex impedance Cole-Cole plots showed a negative temperature coefficient of resistivity (NTCR) behavior of the Ba<sub>0.95</sub>Bi<sub>0.05</sub>Ti<sub>1-x</sub>Fe<sub>x</sub>O<sub>3</sub> materials and increased in grain and grain boundaries resistivity. The relaxation behavior in the test materials is found to be of non-Debye type.</span></p>