fig8
![Microstructural evolution and ferroelectricity in HfO<sub>2 </sub>films](https://image.oaes.cc/acb286e2-3aef-4c4b-b87e-31f17f58d8a1/4637.fig.8.jpg)
Figure 8. (A) Evolution of polarization-electric field and permittivity-electric field hysteresis with increasing thickness of undoped HfO2 thin films. (B) TEM micrograph of typical grains in 6 and 20 nm-thick HfO2 films[93]. TEM: Transmission electron microscopy.