Critical decrease of piezoelectric intrinsic polarity

Some peculiarities of piezoelectric crystals would be described by a concept of their intrinsic(latent) polarity. Its components show a critical law ΔP ∼ (Θ - T) n and vanish at the phase transition temperature Θ. The parameter n = 1 if all components of intrinsic polarity are arranged in the one plane (two-dimensional case, 2D). For spatial (3D) latent polarity components disposition the exponent n = 2. These differ essentially from 1D ferroelectric spontaneous polarization that shows Ps(T) critical law with n = 0.5.