Titanium dioxide (TiO2) anatase (A) nanoparticles co-doped with La/V ions were synthesized by a precipitation technique. The samples were structurally characterized by the X-ray diffraction and optically by the absorption spectroscopy methods. It was concluded under certain preparation conditions in the formation of substitutional solid solutions of type core/shell structure. Therefore, dielectric investigations were performed and established the creation of weak colossal permittivity (CP) with prepared La/V-codoped TiO2 (A). The results were explained in the framework of the core/shell model and doping mechanisms. The calcination of the samples at 1,000°C transformed the [A] structure to rutile [R] and removed the CP. Moreover, it was established that the preparation of the ceramic by a solid-state reaction processing technique of fine powders of mixed oxides (TiO2, La2O3, and V2O5) cannot create CP. Therefore, the preparation procedure is a critical condition to obtain CP.
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