| Doping Fe and Co Induced Modification in the Structural,
Optical and Colossal Permittivity of Nb-doped TiO2 Ceramics |
Aqeel Aziz Dakhel* and Adnan Jaafar
Pages : 307-312
DOI : 10.1080/0371750X.2023.2269208 |
| 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 (??~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.
[Keywords: Ceramics, Colossal permittivity, Nb/Co co-doped TiO2, Nb/Fe co-doped
TiO2] |
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