Electrical and thermal characterization of Sm3+ doped ceria electrolytes synthesized by combustion technique

R. V. Mangalaraja, S. Ananthakumar, M. Paulraj, H. Pesenti, Marta López, Carlos P. Camurri, Loreto A. Barcos, Ricardo E. Avila

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Nanocrystalline samarium doped ceria electrolyte [Ce0.9Sm 0.1O1.95] was synthesized by citrate gel combustion technique involving mixtures of cerium nitrate oxidizer (O) and citric acid fuel (F) taken in the ratio of O/F = 1. The as-combusted precursors were calcined at 700 °C/2 h to obtain fully crystalline ceria nano particles. It was further made into cylindrical pellets by compaction and sintered at 1200 °C with different soaking periods of 2, 4 and 6 h. The sintered ceria was characterized for the microstructures, electrical conductivity, thermal conductivity and thermal diffusivity properties. In addition, the combustion derived ceria powder was also analysed for the crystallinity, BET surface area, particle size and powder morphology. Sintered ceria samples attained nearly 98% of the theoretical density at 1200 °C/6 h. The sintered microstructures exhibit dense ceria grains of size less than 500 nm. The electrical conductivity measurements showed the conductivity value of the order of 10-2 S cm-1 at 600 °C with activation energy of 0.84 eV between the temperatures 100 and 650 °C for ceria samples sintered at 1200 °C for 6 h. The room temperature thermal diffusivity and thermal conductivity values were determined as 0.5 × 10-6 m2 s-1 and 1.2 W m-1 K-1, respectively.

Original languageEnglish
Pages (from-to)134-140
Number of pages7
JournalJournal of Alloys and Compounds
Volume510
Issue number1
DOIs
StatePublished - 5 Jan 2011
Externally publishedYes

Keywords

  • Ceria nanoparticles
  • Combustion synthesis
  • Doped ceria
  • Electrical conductivity
  • Samarium
  • Thermal property

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