High-Temperature Reactions Between Scandia-doped Zirconia (ScSZ) and Cathode Materials

The high-temperature reactions of some familiar cathode materials like strontium doped lanthanum manganite (LSM), strontium doped samarium manganite (SSM) and strontium and cobalt doped lanthanum ferrite (LSCF) with a 10 mol% scandium doped zirconia (10ScSZ) electrolyte material were investigated. After annealing, the mixtures of cathode and electrolyte materials for 100 hours at 1200 degrees C in air, the LSM-ScSZ and the SSM-ScSZ mixtures remained biphased. Nevertheless, the LSM shows a better adhesion with the ScSZ compared to the SSM. This is due to the formation of pores at the SSM-ScSZ interface. The formation of a tetragonal zirconia phase was observed in combination with SSM. This situation remains unclear for the LSCF-ScSZ mixture due to the presence of secondary phases. Among these is one having a good adhesion to the ScSZ. Additionally, a CoFe2O4 spinel was found for the LSCF.