Abstract
Transmission electron microscopic (TEM) studies have elucidated SrZrO3 formation and growth at La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)/ Ce0.9Gd0.1O2 (GDC) / yttria-stabilized zirconia (YSZ) interfaces in the solid oxide fuel cell (SOFC). SrZrO3 forms firstly at the GDC/YSZ interface: at the interface between GDC dense layer and YSZ, at grain boundaries in the GDC dense layer and on the surface of the GDC dense layer during sintering LSCF at 1100 oC. Then, SrZrO3 grows to the both sides of YSZ electrolyte and porous GDC layer. Electron energy loss spectroscopy revealed the inter-diffusion of La, Ce and Gd as well as Sr and Zr in the vicinity of the GDC/YSZ interface. La is solute in SrZrO3, and SrZrO3 shows tetragonal crystal structure, which has the double pseudocubic perovskite subcell. Nucleation and growth of SrZrO3 orthorhombic phase was observed at 800 oC under an O2 atmosphere in an environmental TEM.
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