Multiphase transformation and Ostwald’s rule of stages during crystallization of a metal phosphate

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Reference

Chung, S.-Y., Kim, Y.-M., Kim, J.-G. & Kim, Y.-J., Nature Phys. 5, 68-73 (2009).

Keywords

nucleation, Ostwald's rule of stages, olivine, multi-phase crystallization

Summary

Figure 1

This paper shows the first atom-scale evidence of Ostwald's rule of stages in an inorganic compound. This has been difficult to do, because of the short time-scales and high temperatures at which crystallization occurs. Chung et al. observed the crystallization of LiFePO4 at 450o C over the course of 3-4 minutes, using in-situ high-resolution electron microscopy (HREM). They were able to confirm the existence of 3 metastable states by studying the diffraction patterns of the structures. The last transfomation yielded the known stable olivine crystalline structure of LiFePO4.