In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La2NiO4

Lattice defects significantly affect the mechanical properties of crystalline metal oxides. The materials for components solid oxide fuel cells (SOFCs) are no exception, and hence understanding interplay between lattice is important to ensure stability SOFCs. Herein, we performed an in situ evaluation temperature P(O2) dependence elastic moduli La2NiO4 (LN214), a candidate cathode material SOFCs, using resonance method understand influence interstitial oxygen on its properties. Above 873 K, both Young’s shear LN214 slightly decreased with increasing P(O2), suggesting that these correlated concentration oxygen. We analyzed modulus LN214, based numerically obtained energy. was found be essentially explained by variation c-lattice constant, which triggered concentration. These findings may contribute better relationship properties, improvement