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Ceramics 2019, 2(1), 64-73; https://doi.org/10.3390/ceramics2010006

Flash Sintering Samaria-Doped Ceria–Carbon Nanotube Composites

1
Energy and Nuclear Research Institute—IPEN, S. Paulo 05508-170, Brazil
2
Engineering, Modeling and Applied Social Sciences Center, Federal University of ABC, Santo André 09210-580, Brazil
*
Author to whom correspondence should be addressed.
Received: 24 October 2018 / Revised: 10 January 2019 / Accepted: 14 January 2019 / Published: 18 January 2019
(This article belongs to the Special Issue Novel Processing Routes of Ceramics for Functional Applications)
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Abstract

Composite ceramic green pellets were prepared by attrition milling a mixture of (CeO2)0.8(Sm2O3)0.2 (samaria-doped ceria, SDC) ceramic powder and carbon nanotubes (CNTs), followed by uniaxial and isostatic pressing. The pellets were sintered inside a dilatometer by applying AC electric fields at 850 °C and limiting the electric current to 1 A, achieving 20.2% final shrinkage. The SDC samples reached 13.3% shrinkage under the same conditions. Higher average grain sizes were measured in specimens flash sintered with CNTs. Impedance spectroscopy analyses show that the specimens flash sintered with addition of CNTs have higher electrical conductivity. Higher delivered Joule heating at the interfaces due to the presence of the electronic conductors (CNTs) are proposed as the main reason for that improvement of the electrical behavior. View Full-Text
Keywords: solid electrolytes; samaria-doped ceria; carbon nanotubes; flash sintering; impedance spectroscopy solid electrolytes; samaria-doped ceria; carbon nanotubes; flash sintering; impedance spectroscopy
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Muccillo, R.; S. Ferlauto, A.; N.S. Muccillo, E. Flash Sintering Samaria-Doped Ceria–Carbon Nanotube Composites. Ceramics 2019, 2, 64-73.

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