Weakly polar ferroelectricity: dielectric properties and possible nature
Tagantsev A. K.
A relationship has been established (for the first time) between the effective charge of a soft mode in a weakly polar ferroelectric and a component of the order parameter for the phase transition from a hypothetical "regular" phase into a paraphase. A temperature anomaly in the dielectric response of a weakly polar ferroelectric should have an unusual shape.