Abstract
Lanthanum-based perovskites has emerged to be a promising candidate as cathode for solid oxide fuel cells (SOFCs) and as oxygen separation membrane. With regard to mechanical properties, anomalous behavior, known as ferroelasticity, has been reported in recent years. Systematical and experimental investigation relates to ferroelastic material has not been conducted to date. In the present study, we conducted X-ray diffraction (XRD), observing crystal surface with scanning electron microscope (SEM) and uniaxial compression test in room temperature to discover relation between lanthanum-based perovskites and addition ion. Both rhombohedral crystal and orthorhombic crystal perovskites showed ferroelasticity, but orthorhombic crystal showed slightly. With regard to rhombohedral crystal perovskites, when crystal lattice distortion (cubic based) is large, critical stress is higher value, residual strain is large.
