Electrical conductivity and grain growth of 12Ce-TZP
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2021
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BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS
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Resumo
Ceramic materials based on tetragonal zirconia polycrystals (TZP) with yttrium or cerium
oxide have been thoroughly studied for a number of technological applications, due to their
outstanding thermomechanical properties. In this work, tetragonal zirconia polycrystals
containing 12 mol% cerium oxide (12Ce-TZP) were prepared by solid-state reaction using
different sintering methods, to evaluate the influence of the final microstructure on the
electrical conductivity. High purity zirconium oxide and cerium oxide starting chemicals
were weighted in the stoichiometric proportion and ball-milled for 6 h for homogenization.
Cylindrical specimens were prepared by pressing followed by sintering. Sintering
experiments were carried out by the conventional and the two-stage methods. The mean
grain size of specimens sintered by the conventional method achieved approximately 2.4
mm after sintering at 1450 ºC/5 h, whereas those sintered by the two-stage method exhibit
less than 1.5 mm even after 10 h at 1350 ºC, in the second stage of sintering. The electrical
conductivity determined by impedance spectroscopy shows the usual Arrhenius behavior for
both the bulk (or intragrain) and grain boundary (intergrain) conductivities, with activation
energies of ~0.97 (bulk) and 1.25 eV (grain boundary). The grain conductivity of specimens
sintered by different methods does not depend on the grain size. In contrast, the grain
boundary conductivity is higher for specimens sintered by the two-stage method, possibly
due to dissolution of minor impurities located at grain boundaries into the bulk, during the
long holding times of the two-stage method.
Como referenciar
FERREIRA, LUCAS A. dos S.; MUCCILLO, ELIANA N. dos S. Electrical conductivity and grain growth of 12Ce-TZP. In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS, August 30 - September 3, 2021, Online. Abstract... São Carlos, SP: Aptor Software, 2021. p. 45-45. Disponível em: http://repositorio.ipen.br/handle/123456789/32841. 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.