Abstract
The Mg2+/Ta5+ codoped rutile TiO2 ceramic with a nominal composition (Mg1/3Ta2/3)0.01Ti0.99O2 was synthesized using a conventional solid-state reaction method and sintered at 1400 °C for 2 h. The pure phase of the rutile TiO2 structure with a highly dense microstructure was obtained. A high dielectric permittivity (2.9 × 104 at 103 Hz) with a low loss tangent (<0.025) was achieved in the as-sintered ceramic. After removing the outer surface, the dielectric permittivity of the polished ceramic increased from 2.9 × 104 to 6.0 × 104, while the loss tangent also increased (~0.11). The dielectric permittivity and loss tangent could be recovered to the initial value of the as-sintered ceramic by annealing the polished ceramic in air. Notably, in the temperature range of −60–200 °C, the dielectric permittivity (103 Hz) of the annealed ceramic was slightly dependent (<±4.4%), while the loss tangent was very low (0.015–0.036). The giant dielectric properties were likely contributed by the insulating grain boundaries and insulative surface layer effects.
Highlights
Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3 Ta2/3 )0.01 Ti0.99 O2 Ceramic
(r6 = 72 pm), and Ti4+ (r6 = 60.5 pm). This result was similar to other acceptors/donors codoped TiO2 systems reported in the literature [18,21,24]
The MTTO ceramics were prepared by the solid-state reaction (SSR) method
Summary
Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg1/3 Ta2/3 )0.01 Ti0.99 O2 Ceramic. The crucial way to significantly improve the properties of MLCCS is to use a giant dielectric material with a high dielectric permittivity of ε0 > 104. The dielectric loss tangent (tanδ) of most giant dielectric oxides is still huge (>>0.1), which is not required for use in MLCCs. the importance of developing MLCCs with good temperature stability and electroceramics for high energy density capacitors has been widely reported [11,12,13]. The (ln1/2 Nb1/2 )0.1 Ti0.90 O2 exhibited outstanding dielectric performance properties, including a high ε0 (>104 ), low tanδ (
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