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

Author(s)

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]}

Affiliation

^[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

• Document type: Journal article
• Source: SCRIPTA MATERIALIA; v. 203, OCT 2021.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 18/04331-5 - Instrumentation and automation of a furnace adapted to flash sintering
• Grantee: João Vitor Campos
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 19/03786-1 - Instrumentation and automation of a tube furnace adapted to flash sintering
• Grantee: João Vitor Campos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 19/14677-9 - Influence of the Multi Step Flash Sintering technique on the microstructural control of ZrO2
• Grantee: Eliria Maria de Jesus Agnolon Pallone
• Support Opportunities: Regular Research Grants