Impact of Mn ions concentration on the structural, optical and insulating properties of (Y/Mn) merged codoped TiO₂ polymorphs synthesized by hydrothermal decomposition technique

Undoped and Y/Mn-codoped TiO₂ nanoparticle ceramic samples have been synthesized by a hydrothermal decomposition technique. The concentration of Y ions was 3 at% while that of Mn ions were 1 at%, 2 at%, and 3 at%. The nanoparticle samples were characterised by X‐Ray diffraction and diffuse optical reflection spectroscopy to study their structural and optical properties. The present work was planned to employ the mechanisms of doping principles to fabricate a dielectric crystalline solid solution medium of core/shell electronic structures with colossal permittivity properties. The AC-electrical conductivity according to the correlated barrier hopping model was also investigated. The measured values at 1 kHz were 10³–10⁵ depending on the Mn ions concentration and phase structure, while the permittivity for undoped Anatase is ~ 80–170. Therefore, the present objective was successfully achieved.

Frequency-dependence of AC-conductance (G_AC) of the synthesized codoped TiO₂ ceramics.