Figure 6From: Preparation and Characterization of Nano structured Materials from Fly Ash: A Waste from Thermal Power Stations, by High Energy Ball MillingVariation in peak height with milling time. (----) indicates quartz peak at 2θ = 20.86°, (- - -) indicates mullite peak at 2θ = 40.858 and (-·-·-) indicates iron oxide peak at 35.29°Back to article page