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Interaction of solid electrolyte La0.88Sr0.12Ga0.82Mg0.18O2.85 with hydrogen, water vapor, and carbon dioxide

“…The electrolyte has a cubic structure only at temperatures in excess of 620°ë . That this is the fact indeed was demonstrated in works [2,3]. With the temperature being gradually reduced, a dilatometry method reliably reveals two phase transitions of second kind.…”

“…The existence of a surface layer with another structure was shown by an x-ray diffraction method [1][2][3], albeit at room temperature, i.e. in a two-phase region.…”

“…2 Parallel-plate tablets of a diameter 9.9 mm and a thickness of ~0.7-1 mm were cut out of the ceramics. These were washed in an alcohol and annealed at 1000°ë for a duration of an hour.…”

“…where the overall polarization conductivity of the electrode is provided for only at the expense of σ η (1) , the xray diffraction pattern suggests that the electrolyte does not have a lattice of a cubic symmetry. Whereas initial specimens of the electrolyte, as well as the electrolyte of specimens that showed a tangible contribution made by σ η (2) , are cubic. Once a layer 10-15 µ m thick is removed from the surface of specimens that revealed a symmetry other than cubic, the material again becomes cubic.…”

“…The magnitude of the partial polarization conductivity σ η (1) depends but weakly on the electrode manufacture conditions. The other summand was the partial polarization conductivity σ η (2) . This constituent was referred to the process of direct exchange by oxygen between the electrolyte and the gas phase.…”