Defects have gained increasing attention for their capability in
tailoring the properties and/or exploring new functionalities in
oxide materials. For instance, the colossal permittivity (CP,
>103) was successfully achieved by introducing the acceptor/donor
co-doping in rutile TiO2. The resultant dielectric properties can
be either affected by the defect-induced polarisation or totally
dominated by the defects. The defect configurations and its
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