Electrical behaviour and microstructural characterization of magnesia co-doped ScSZ nanopowders synthesized by urea co-precipitation

Grazia Accardo, Gianfranco Dell'agli, Domenico Frattini, Luca Spiridigliozzi, Suk Woo Nam, Sung Pil Yoon

Research output: Chapter in Book/Report/Conference proceedingChapter

10 Citations (Scopus)

Abstract

In this study Scandia-doped zirconia co-doped with MgO, (MgO)0.03(ZrO2)0.88(Sc2O3)0.09, was synthetized by using the urea co-precipitation method in hot aqueous solution. MgO was added to prevent the transformation of cubic fluorite Sc-doped ZrO2 into rhombohedral phase, with worst electrical properties. The as-prepared powders were completely amorphous and, by a calcination step at 500 °C for 1 h, full conversion to fluorite phase occurred preserving the nano size character of powders. The presence of MgO allowed to effectively stabilize the cubic fluorite phase also after a prolonged thermal treatment at 1200 °C. The nanometric feature of the powder aided the sintering step of this material at 1600 °C. The EIS electrical characterization revealed that its ionic conductivity is 7.3.10-2 S/cm and 2.8.10-2 S/cm at 800 °C and 700 °C, respectively. Therefore, this material is suitable as ceramic electrolyte in SOFC operated at intermediate temperatures.

Original languageEnglish
Title of host publicationChemical Engineering Transactions
EditorsSerafim Bakalis, Laura Piazza, Sauro Pierucci, Jiri Jaromir Klemes
PublisherItalian Association of Chemical Engineering - AIDIC
Pages1345-1350
Number of pages6
Volume57
ISBN (Electronic)9788895608488
DOIs
Publication statusPublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)

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