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

Journal Article · · Scripta Materialia
 [1];  [1];  [2];  [2];  [3];  [2];  [4];  [5]
  1. Univ. of Sao Paulo (Brazil); Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Univ. of Sao Paulo (Brazil)
  5. Univ. of Colorado, Boulder, CO (United States); Univ. Federal de Sao Carlos (UFSCAR) (Brazil)

Here, we discuss the Arrhenius behavior of electrical conductivity σ during flash sintering of 3 mol% yttria stabilized zirconia (3YSZ). In situ x-ray diffraction is used to determine sample temperature. Sintering contribution to σ 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(σ) 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Sao Paulo Research Foundation (FAPESP); National Council for Scientific and Technological Development (CNPq); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
SC0012704
OSTI ID:
1817201
Alternate ID(s):
OSTI ID: 1804581
OSTI ID: 23199644
Report Number(s):
BNL--222041-2021-JAAM
Journal Information:
Scripta Materialia, Journal Name: Scripta Materialia Vol. 203; ISSN 1359-6462
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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