On the Arrhenius-like behavior of conductivity during flash sintering of 3 mol% yttria stabilized zirconia ceramics

Autor(es)

V. Campos, Joao ^{[1, 2, 3]} ; Lavagnini, Isabela R. ^{[1, 2, 3]} ; Avila, Viviana ^[1] ; Yoon, Bola ^[1] ; Ghose, Sanjit ^[4] ; Raj, Rishi ^[1] ; Pallone, Eliria M. J. A. ^{[2, 3]} ; Jesus, Lilian M. ^{[1, 5]}

Afiliação do(s) autor(es)

^[1] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 - USA

^[2] Univ Sao Paulo, USP, Dept Biosyst Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Sao Paulo, USP, FZEA, Postgrad Programme Mat Sci & Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga - Brazil

^[4] Brookhaven Natl Lab, Energy Sci Directorate, Photon Sci Div, NSLS II, Upton, NY 11973 - USA

^[5] Univ Fed Sao Carlos UFSCAR, Dept Phys, Grp Adv Funct Mat MAFA, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCRIPTA MATERIALIA; v. 203, OCT 2021.
• Citações Web of Science: 0

Resumo

We discuss the Arrhenius behavior of electrical conductivity sigma during flash sintering of 3 mol% yttria stabilized zirconia (3YSZ). In situ x-ray diffraction is used to determine sample temperature. Sintering contribution to sigma is excluded by investigating the flash event on a dense ceramic. We show that total conductivity follows an Arrhenius-like equation in both dense and green samples, even during Stage II of flash. The non-linearity often verified during flash sintering of 3YSZ is therefore related to the furnace temperature instead of the sample temperature when building the ln(sigma) vs. 1/T plots. Furthermore, we verified a change in the activation energy for conduction prior to the ignition of the flash event and discussed the possible mechanisms. For instance, the decrease in activation energy from Stage I to II in the dense sample is attributed to a contribution from electronic carriers. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 18/04331-5 - Instrumentação e automação de forno tubular adaptado à técnica flash sintering
• Beneficiário: João Vitor Campos
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 19/03786-1 - Instrumentação e automação de forno tubular adaptado à técnica flash sintering
• Beneficiário: João Vitor Campos
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 19/14677-9 - Influência da técnica Multi Step Flash Sintering no controle microestrutural da ZrO2
• Beneficiário: Eliria Maria de Jesus Agnolon Pallone
• Modalidade de apoio: Auxílio à Pesquisa - Regular