Abstract
Fe/Nb and Co/Nb co-doped TiO2 ceramics were synthesized by conventional ceramic solid-state reaction process in order to create a high dielectric permittivity substance. Comprehensive structural, optical and dielectric studies were carried out on the samples of formula Nb:TiO2, Fe:(TiO2:Nb) and Co:(TiO2:Nb). The structural and optical characterizations were performed with X-ray diffraction and diffuse reflection spectroscopy, respectively. The dielectric properties including colossal permittivity (CP) were investigated at room temperature in the frequency range of 0.1-100 kHz. The novelty of the present work was to create a CP (ϵ′∼104-105) in host TiO2 by codoping with (Co/Nb) and study the change in the CP by using Fe ions instead of Co ions. The results were explained in the framework of the core/shell model and doping mechanisms.
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