31. There are a few crystal structures, notably the perovskite structure, which exhibit ferroelectric behavior. 32. Soft transducers in the form of ferroelectric polymer foams have been proved to have great potential. 33. Electrical hysteresis typically occurs in ferroelectric material, where domains of polarization contribute to the total polarization. 34. In ferroelectric materials there is a spontaneous electric polarisation in the absence of an applied electric field. 35. Ferroelectric materials are all piezoelectric and therefore have a spontaneous electric polarisation as the structures are unsymmetrical.36. A ferroelectric material has a nonlinear relationship between the applied electric field and the apparent stored charge. 37. Other structures were discovered to possess ferroelectric properties, such as polytrifluoroethylene and odd-numbered nylon. 38. In memory applications, the stored value of a ferroelectric capacitor is read by applying an electric field. 39. Therefore, new ferroelectric driving mechanisms must be present for electric and magnetic ferroic order to occur simultaneously. 40. Quantum criticality was first observed in ferroelectrics, in which the ferroelectric transition temperature is suppressed to zero.
