Fig. 1: Schematic diagram of P-E loops of dielectric materials.
From: Giant energy density nitride dielectrics enabled by a paraelectric-metaparaelectric phase transition
a FE, b RFE, c AFE-FE, and d PE-MPE phase transition under electric field. The blue areas represent energy density W. E0 represents phase transition field. In panel d, the polarization increases linearly and slowly at low electric field; then, the system enters a second linear regime (MPE region) where the polarization grows more quickly, to eventually yield a large saturation polarization that occurs only at large fields.
