Unusual Lattice Parameters Behavior for La1.9Ca0.1NiO4+? at the Temperatures below Oxygen Loss

In this work, we studied the structural features of La1.9Ca0.1NiO4.11, which is considered a promising cathode material for intermediate temperature solid-oxide fuel cells (IT-SOFC). The effect different pretreatments on characteristics sample was using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) in order to elucidate origin peculiar change lattice parameters observed earlier during situ XRD studies. studies have shown that anisotropic broadening reflections with high Miller index l appears after tempering quenched (from 1100 °C) at 250 °C. This too low release/incorporation oxygen into structure but sufficient migration inside structure. HRTEM assisted us revealing differences defect pretreatments. Based obtained results, following possible explanation proposed. Observed additional microstrains non-oriented planar defects as well decrease coherent scattering region size [00l] direction are caused by non-homogeneous redistribution interstitial tempering.