The effect of both the molding pressure and the sintering conditions on a density of solid oxide electrolyte La0.88Sr0.12Ga0.82Mg0.18O2.85 is studied. The ablation process of material components from ceramics surface to vaporous state at temperature up from 1573 К is observed. The lattice constant also changes at these conditions. It is assumed that phase transition exists that is responsible to these two phenomena.
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