Effects of defect dipoles on the colossal permittivity of ambipolar co-doped rutile TiO ceramics
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2020
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This 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.
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Ambipolar co-doping, Colossal permittivity, Defect dipole, Fuoss–kirkwood model, TiO2
Citação
LIRA, 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.