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On synthesis, phase purity, and oxygen stoichiometry of sodium and calcium cobaltate thermoelectrics

On synthesis, phase purity, and oxygen stoichiometry of sodium and calcium cobaltate thermoelectrics

Kategori
Vitenskapelig foredrag
Sammendrag
Relatively high concentrations of oxygen vacancies and effects on thermoelectric properties have been reported in the literature on state-of-the-art thermoelectric sodium cobaltates. However, first principle calculations suggest high energies and low concentrations of such vacancies. Experiments in our laboratory indicate that apparent oxygen non-stoichiometry may have stemmed from secondary phases present after decomposition in two-phase regions during synthesis and measurements. In a similar manner, experimental evaluation and defect-chemical interpretation of non-stoichiometry in calcium cobaltate thermoelectrics are troubled by non-trivial synthesis and sample fabrication. Recent results on these matters are presented and discussed.
Oppdragsgiver
  • Research Council of Norway (RCN) / 200022
Språk
Engelsk
Forfatter(e)
Institusjon(er)
  • Universitetet i Oslo
  • SINTEF Industri / Bærekraftig energiteknologi
  • Ukjent
Presentert på
37th International Conference & Exposition on Advanced Ceramics and Composites
Sted
Daytona Beach, Florida
Dato
27.01.2013 - 01.02.2013
Arrangør
The American Ceramic Society
År