Effect of the sintering conditions on the morphology of La9.33Si2Ge4O26 oxyapatite for SOFCs electrolytes

Macatrão, Mafalda; Santos, Mário João dos; Alves, Cátia; Oliveira, Fernando Almeida Costa; Marcelo, Teresa; Mascarenhas, João; Trindade, B.

http://hdl.handle.net/10400.9/2187

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Authors

Macatrão, Mafalda

Santos, Mário João dos

Alves, Cátia

Oliveira, Fernando Almeida Costa

Marcelo, Teresa

Mascarenhas, João

Trindade, B.

Abstract(s)

Solid oxide fuel cells (SOFCs) are devices that allow direct conversion of chemical to electrical energy through an electrochemical reaction in a cleaner and more efficient way than conventional processes (eg. gas turbines). They are characterized by the use of a solid oxide material as the electrolyte. Yttria-stabilised zirconia (YSZ) has traditionally been used in SOFCs electrolytes at temperatures in the range of 850-1000 °C. Recent research is being focused on the development of new materials with increased ionic conductivity at intermediate temperatures (500-800ºC) as alternative materials to YSZ. Rare earth silicates with an apatite-type structure, such as doped lanthanum oxides of general formula La10(MO4)6O2, where M = Ge, Co, Si, Al, or P, are among these materials. The major limitation associated with the manufacture of these materials is their poor sinterability, which requires high sintering temperatures (1600ºC).

Keywords

SOFC Electrolytes Sintering

URI

http://hdl.handle.net/10400.9/2187

Citation

Macatrão, M.; Santos, M.; Alves, C.; Oliveira, F.A.C.; Marcelo, T.; Mascarenhas, J.; Trindade, B. Effect of the sintering conditions on the morphology of La9.33Si2Ge4O26 oxyapatite for SOFCs electrolytes. In: Microscopy and Microanalysis, 2013, Vol. 19, Suppl 4, p. 117-118