Figure 4.

XRD patterns showing phase transition of nanoscale KNO3 powders. Obtained upon heat-treating gels at different temperatures: (a) orthorhombic to tetragonal (600°C), (b) tetragonal to cubic (600°C), (c) orthorhombic to tetragonal (700°C), (d) tetragonal to cubic (700°C), (e) orthorhombic to tetragonal (800°C), and (f) tetragonal to cubic (800°C).

Chen et al. Nanoscale Research Letters 2011 6:530   doi:10.1186/1556-276X-6-530
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