Fig. 2

Difference between perovskite- and fluorite-structure ferroelectrics. a Two different crystalline phases at the interface of MPB with different atomic structure in PZT (PbZrO₃ − PbTiO₃, upper row), and HZO (lower row). b Phase diagram and c electro-mechanical properties of PZT with various PbZrO₃ mol %. d Phase and e dielectric constant of HZO system with different thickness and Zr ratio. a was reproduced under a Creative Commons Attribution 3.0 Unported License [40] and AIP Publishing LLC, copyright 2015 [41] respectively. b was reprinted under a Creative Commons Attribution 3.0 Unported License [42] copyright 2015. c–e were reproduced with permission from [12].