Figure 5
From: A novel approach to low-temperature synthesis of cubic HfO2 nanostructures and their cytotoxicity
(a) XRD patterns show the cubic-to-monoclinic conversion of HfO2 with calcination; (b) crystallographic structural transformation from cubic-to-monoclinic HfO2 upon calcination at temperatures greater than 500 °C (red and olive-green spheres represent O and Hf atoms, respectively).
