Figure 5. Anisotropy of dielectric and piezoelectric properties.

Orientation dependence of (a) dielectric permittivity ɛ_r*(θ), (b) piezoelectric strain coefficient d₃₃*(θ), and (c) piezoelectric voltage coefficient g₃₃*(θ) of tetragonal PbTiO₃ crystal. (d) Cross-section of the surface of (a); (e) cross-section of the surface of (b); (f) cross-section of the surface of (c). The coordinate system indicates crystallographic axes. Numbers on axes indicate values of ɛ_r*(θ), d₃₃*(θ), g₃₃*(θ), respectively.