fig4
![Microstructural evolution and ferroelectricity in HfO<sub>2 </sub>films](https://image.oaes.cc/acb286e2-3aef-4c4b-b87e-31f17f58d8a1/4637.fig.4.jpg)
Figure 4. Polar R-phase (R3m) viewed from (A) the [001] axis and (B) the [100] axis of bulk HfO2 obtained by first-principles calculations. Hf and O atoms are represented by green and blue spheres, respectively[29].
Figure 4. Polar R-phase (R3m) viewed from (A) the [001] axis and (B) the [100] axis of bulk HfO2 obtained by first-principles calculations. Hf and O atoms are represented by green and blue spheres, respectively[29].
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