Effects of defect dipoles on the colossal permittivity of ambipolar co-doped rutile TiO ceramics

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dc.creatorLira, Stefane Oliveira de
dc.creatorSilva, Raphael Lucas de Sousa e
dc.creatorBanerjee, Parag
dc.creatorFranco Júnior, Adolfo
dc.date.accessioned2023-10-30T13:00:09Z
dc.date.available2023-10-30T13:00:09Z
dc.date.issued2020
dc.description.abstractThis study investigated the colossal permittivity of ambipolar co-doped rutile TiO2 ceramics obtained using the solid state sintering method for use as alternatives to high-performance dielectric materials. Ambipolar co-doping was conducted with compositions comprising Ti0:995ðNb1:33ðAl1 xCrxÞ0:666Þ0:005O2, where x ¼ 0, 0.3, 0.5, 0.7, 0.9, and 1. Analysis based on X-ray diffraction, Fourier transform-infrared spectroscopy, and Raman spectra showed that the dopants did not alter the crystal structure of rutile but they created some distortion in the TiO2 lattice. Analysis of the dielectric properties showed that the ceramics exhibited relatively low loss with colossal permittivity at room temperature. The existence of an asymmetrical relaxation mechanism was demonstrated with the Fuoss–Kirkwood dielectric model. The combined functions of defect dipoles and localized electrons were investigated for ambipolar co-doped TiO2 ceramics for use in high-density RAM and microelectronics applications.
dc.identifier.citationLIRA, Stefane Oliveira de et al. Effects of defect dipoles on the colossal permittivity of ambipolar co-doped rutile TiO ceramics. Journal of Physics and Chemistry of Solids, Amsterdam, v. 143, e109456, 2020. DOI: 10.1016/j.jpcs.2020.109456. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022369719326174. Acesso em: 4 set. 2023.
dc.identifier.doi10.1016/j.jpcs.2020.109456
dc.identifier.issn0022-3697
dc.identifier.issne- 1879-2553
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022369719326174
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectAmbipolar co-doping
dc.subjectColossal permittivity
dc.subjectDefect dipole
dc.subjectFuoss–kirkwood model
dc.subjectTiO2
dc.titleEffects of defect dipoles on the colossal permittivity of ambipolar co-doped rutile TiO ceramics
dc.typeArtigo

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