Room-temperature creep of LaCoO(3)-based perovskites: Equilibrium strain under compression

This study concerns an experimental investigation of room-temperature creep at different stresses in polycrystalline LaCoO(3)-based oxides under compression. A phenomenological approach for ferroelastic creep is proposed to identify the most important parameters that affect creep strain over different time periods. An analytical expression is obtained instead of the previously used power law, allowing an estimation of equilibrium strain at constant stress. An expression is also proposed to calculate the characteristic time of creep and recovery processes. The equilibrium creep diagrams for LaCoO(3) and La(0.8)Ca(0.2)CoO(3) perovskites have been determined