Preparation, characterization, electrical properties and giant dielectric response in (In + Nb) co-doped TiO2 ceramics synthesized by a urea chemical-combustion method
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Pure rutile phase of nanocrystalline (In + Nb) co-doped TiO2 (INTO) ceramics were prepared by a chemical combustion method using urea as fuel. Dense ceramic microstructure can be obtained by sintering INTO nanocrystalline powders. Good dispersion of In3+ and Nb5+ co-doping ions in the microstructure is observed. Notably, high dielectric permittivity (≈20,674) and low loss tangent (≈0.054) at a low frequency and 30 °C are achieved in the (In1/2Nb1/2)0.015Ti0.985O2 ceramic. Using an impedance spectroscopy, the INTO ceramics are confirmed to be electrically heterogeneous, consisting of semiconducting and insulating phases. The giant dielectric response in INTO ceramics can suitably be explained by the interfacial polarization. The low value of the loss tangent of INTO ceramics is attributed to a large value of resistivity of insulating phase.
KeywordsCCTO Ceramic High Dielectric Permittivity NbCl5 Spark Plasma Sinter Method Internal Barrier Layer Capacitor
This work is supported by the Thailand Research Fund (TRF) under the TRF Senior Research Scholar [Grant Number RTA5680008]. It was partially supported by the Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand, through its program of Center of Excellence Network. T.N. would like to thank the Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage for her Master Degree scholarship.
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