Figure 5
From: Large anisotropy of ferroelectric and pyroelectric properties in heteroepitaxial oxide layers
Some sketched basic features of ferroelectric materials, in bulk form (a,b) and epitaxial films (c,d), to take into account for ferroelectric and pyroelectric anisotropy. (a) Variation of the lattice parameters with temperature. (b) Consequent variation of remnant electric polarization with temperature, leading to pyroelectricity. (c) The main orientations of the tetragonal domains, leading to different polydomain structures. (d) Thermal expansion of the substrate.
