In this study a systematic microstructural characterization of La‐modified lead zirconate titanate was carried out by hot‐ and cold‐stage transmission electron microscopy and selected area electron diffraction. The existence of 1/2[111] superlattice reflections (Fspots) became evident near 300 °C on cooling. The intensity of theFspots was found to increase with decreasing temperature, approaching a near constant intensity below 100 °C. In conjunction with compositional studies, it was proposed that theFspots arise from a doubling of the unit cell associated with a tilting of oxygen octahedra. The presence ofFspots at temperatures approaching the onset of local polarization was then interpreted as the existence of a hierarchy of domain states. This hierarchy was proposed to consist of an average‐cubic macroscopic structure containing rhombohedral micropolar regions on the scale of 50–100 A˚ that contain ferroelastic microtwins on the scale of several tens of angstroms.