Figure 5
Four computer-graphic illustrations of various stages during the calcination of amorphous zirconium hydroxide to crystalline oxide, as evinced from X-ray/neutron diffraction and Zr-EXAFS data. (a) Initial array of highly hydrated hydroxide units; (b) close up of hydrated hydroxide unit as a defective distorted two-dimensional raft; (c) the same unit after further calcination/dehydration; (d) condensation of rafts at the early stages of three-dimensional crystallization. |