Next Article in Journal
Assessment of Fatigue Damage and Crack Propagation in Ceramic Matrix Composites by Infrared Thermography
Previous Article in Journal
Functionalization of Hydroxyapatite Ceramics: Raman Mapping Investigation of Silanization
Open AccessArticle

Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria

1
Energy and Nuclear Research Institute, São Paulo 05508-170, Brazil
2
Federal University of ABC, Santo André 09210-580, Brazil
*
Author to whom correspondence should be addressed.
Ceramics 2019, 2(2), 385-392; https://doi.org/10.3390/ceramics2020030
Received: 12 April 2019 / Revised: 10 May 2019 / Accepted: 20 May 2019 / Published: 1 June 2019
  |  
PDF [3231 KB, uploaded 1 June 2019]
  |     |  

Abstract

CeO2:20 mol% Sm2O3 green ceramic pellets were sintered conventionally at 1500 °C/2 h and flash sintered by applying a 200 V cm−1 electric field at 800 °C, 1000 °C and 1200 °C. The thickness shrinkage of the pellets was followed bythe specimen being positioned inside a dilatometer adapted with platinum electrodes and terminal leads connected to a power supply for application of the electric voltage. The microstructure of the surfaces of the sintered samples were observed in a scanning electron microscope. The electrical properties were evaluated by the impedance spectroscopy technique in the 5 Hz–13 MHz frequency range from 210 °C to 280 °C. The main results show that (i) the final shrinkage level is nearly independent of the temperature when the electric field is applied and slightly better than that of the 1500 °C sintered pellet, and (ii) the bulk conductivity of the sample flash sintered at 1200 °C is similar to that of the sample sintered at 1500 °C. The availability of a pathway for the electric current pulse derived from the applied electric field is proposed as the reason for the achieved shrinkages. Scavenging of the grain boundaries by Joule heating is proposed as the reason for the improved oxide ion bulk conductivity. View Full-Text
Keywords: samaria-doped ceria; flash sintering; dilatometry; impedance spectroscopy samaria-doped ceria; flash sintering; dilatometry; impedance spectroscopy
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Reis, S.L.; Carvalho, S.G.; Muccillo, E.N.; Muccillo, R. Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria. Ceramics 2019, 2, 385-392.

Show more citation formats Show less citations formats

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Ceramics EISSN 2571-6131 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top