The intermediate phase can itself host attractive material properties; in the case of HQReO 4 , the ferroelectric coercive field is reduced from 340 kV/cm 2 to below 5 kV/cm 2 in the intermediate temperature phase . Yoneya et al. describe the molecular motion of HQReO 4 in the low, intermediate and high-temperature phases, where the difference between phases is characterized by the number of positions the molecules are allowed to liberate around, as well as the rate of liberation . The liberation of the molecules in the plastic ionic crystals will likely affect the piezoelectric molecular rotation mechanism. Due to the soft nature of the intermolecular bonding, temperature is likely to have a stronger influence on the piezoelectric response of plastic ionic molecular crystals than for inorganic materials.