Abstract
Abstract The effect of mixing process of FeCl3 and NaOH solution on the formation of platy (hexagonal) α-Fe2O3 was investigated at 160 and 180 °C by the hydrothermal process. The crystal growth of platy α-Fe2O3 was promoted at higher hydrothermal temperature, higher concentration of NaOH solution and by the addition of FeCl3 solution to NaOH solution instead of the reverse addition. Platy crystals of α-Fe2O3 showed dark red wine color while nanophase equiaxed crystals showed yellowish red color. The platy crystals of 3–6 µm in average diameter kept their platy structure after heating at 900 and 1100 °C in air due to their higher thermal stability towards sintering.
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