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Fe³⁺/Nb⁵⁺ Co-doped rutile-TiO₂ nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response.

ABSTRACT: Fe³⁺/Nb⁵⁺ co-doped TiO₂ (FeNb-TO) nanocrystalline powders were prepared by a combustion process. A pure rutile-TiO₂ phase of powders and sintered ceramics with a dense microstructure was achieved. Both co-dopants were homogeneously dispersed in the ceramic microstructure. The presence of oxygen vacancies was confirmed by Raman and X-ray photoelectron spectroscopy techniques. The low-frequency dielectric permittivity enhanced as co-doping concentration increased. The thermally activated giant-dielectric relaxation of FeNb-TO ceramics was observed. Removing the outer-surface layer had a slight effect on the dielectric properties of FeNb-TO ceramics. Density functional theory (DFT) calculation showed that, in the energy preferable configuration, the

SUBMITTER: Nachaithong T

PROVIDER: S-EPMC9055153 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Fe³⁺/Nb⁵⁺ Co-doped rutile-TiO₂ nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response.

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Fe3+/Nb5+ Co-doped rutile-TiO2 nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response.

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Fe³⁺/Nb⁵⁺ Co-doped rutile-TiO₂ nanocrystalline powders prepared by a combustion process: preparation and characterization and their giant dielectric response.