New strategy for optimizing the microstructure and giant dielectric properties of TiO<sub>2</sub> <i>via</i> acceptor/donor ratio tuning.

Table 2 summarizes the ε ′ and tan δ values at 25 °C and 1 kHz for all ceramics, where a clear trend is observed: ε ′ decreases with increasing Sc 3+ /Ta 5+ ratio, despite the consistent Ta 5+ doping level.

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