Electrical behavior and microstructural features of electric field-assisted and conventionally sintered 3 mol % yttria-stabilized zirconia
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ZrO2: 3 mol % Y2O3 (3YSZ) polycrystalline pellets were sintered at 1400 C and by applying
an alternating current (AC) electric field at 1000 C. An alumina sample holder with platinum wires
for connecting the sample to a power supply was designed for the electric field-assisted sintering
experiments. The apparent density was evaluated with the Archimedes technique, the grain size
distribution by analysis of scanning electron microscopy images, and the electrical behavior by the
impedance spectroscopy technique. Sintering with the application of AC electric fields to 3YSZ
enhances its ionic conductivity. An explanation is proposed, based on the dissolution back to the bulk
of chemical species, which are depleted at the grain boundaries, leading to an increase in the oxygen
vacancy concentration. For the enhancement of the grain boundary conductivity, an explanation
is given based on the diminution of the concentration of depleted chemical species, which migrate
to the bulk. This migration leads to a decrease of the potential barrier of the space charge region,
known to be responsible for blocking the oxide ions through the intergranular region. Moreover, the
heterogeneity of the distribution of the grain sizes is ascribed to the skin effect, the tendency of the
AC current density to be largest near the surface, decreasing towards the bulk.
Como referenciar
CARVALHO, SABRINA G.M.; MUCCILLO, ELIANA N.S.; MUCCILLO, REGINALDO. Electrical behavior and microstructural features of electric field-assisted and conventionally sintered 3 mol % yttria-stabilized zirconia. Ceramics, v. 1, n. 1, p. 1-10, 2018. DOI: 10.3390/ceramics1010002. Disponível em: http://repositorio.ipen.br/handle/123456789/28936. 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.