Origins of Giant Dielectric Properties with Low Loss Tangent in Rutile (Mg<sub>1/3</sub>Ta<sub>2/3</sub>)<sub>0.01</sub>Ti<sub>0.99</sub>O<sub>2</sub> Ceramic
The Mg<sup>2+</sup>/Ta<sup>5+</sup> codoped rutile TiO<sub>2</sub> ceramic with a nominal composition (Mg<sub>1/3</sub>Ta<sub>2/3</sub>)<sub>0.01</sub>Ti<sub>0.99</sub>O<sub>2</sub> was synthesized using...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/f1793c48c0dc460daea5cd02cd1c13a6 |
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| Sumario: | The Mg<sup>2+</sup>/Ta<sup>5+</sup> codoped rutile TiO<sub>2</sub> ceramic with a nominal composition (Mg<sub>1/3</sub>Ta<sub>2/3</sub>)<sub>0.01</sub>Ti<sub>0.99</sub>O<sub>2</sub> was synthesized using a conventional solid-state reaction method and sintered at 1400 °C for 2 h. The pure phase of the rutile TiO<sub>2</sub> structure with a highly dense microstructure was obtained. A high dielectric permittivity (2.9 × 10<sup>4</sup> at 10<sup>3</sup> 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 × 10<sup>4</sup> to 6.0 × 10<sup>4</sup>, 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 (10<sup>3</sup> 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. |
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