Formation of Secondary Phases at the Interface Between Strontium-Doped Lanthanum Manganite and Yttria-Stabilized Zirconia

Abstract

The formation of secondary phases at the interface between zirconia electrolytes and Sr-doped Lanthanum Manganite in planar Solid Oxide Fuel Cells (SOFCs) was investigated. 8 mol% Yttria-Stabilized Zirconia (YSZ) electrolyte was fabricated by tape casting and coated with the cathode material La 0.65 Sr 0.30 MnO 3 (LSM) by screen-printing. The structures were co-fired under different conditions. The sintered specimens were annealed at 1000°C for various periods. The formation of secondary phases and interdiffusion effects at the interface of these samples were studied by X-ray diffractometry (XRD), scanning and transmission electron microscopy equipped with energy-dispersive spectroscopy (SEM- and TEM-EDS). The results of the formation of secondary phases and diffusion effects are discussed with regard to the processing conditions.