Dielectric properties of TiO2 co-doped with yttrium and niobium
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2024
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BRAZIL MRS MEETING, 22nd
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The effects of small contents (up to10 mol%) of Y2O3 and Nb2O5 on the microstructure and
dielectric properties of TiO2 were investigated, aiming to identify the underlying mechanism
in the colossal permittivity of co-doped specimens. Sintered materials were prepared by the
solid state reaction method and characterized by X-ray diffraction, scanning electron
microscopy, and electrochemical impedance spectroscopy. All sintered specimens exhibited
the characteristic tetragonal TiO2 rutile phase. Secondary phases were detected at the grain
boundaries, independent on the sintering temperature. The mean grain increased with both
sintering temperature and co-dopants content. The higher electric permittivity was obtained
for specimens with 5 mol% of co-dopants, sintered at 1480ºC, and the lowest value of the
dissipation factor for samples with 10 mol%, sintered at 1500ºC. The dielectric properties of
co-doped TiO2 were attributed to the internal barrier layer capacitance and electron-pinned
dipole defect mechanisms.
Como referenciar
MUCCILLO, ELIANA N. dos S.; SILVA, DEBORAH Y.B. da; MUCCILLO, REGINALDO. Dielectric properties of TiO2 co-doped with yttrium and niobium. In: BRAZIL MRS MEETING, 22nd, September 29 - October 3, 2024, Santos, SP. Abstract... São Carlos, SP: Aptor Software, 2024. p. 827-827. Disponível em: https://repositorio.ipen.br/handle/123456789/48942. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.