Transformation of Goethite to Hematite Nanocrystallines by 18 08 2014· α Fe 2 O 3 nanocrystallines were prepared by direct transformation via high energy ball milling treatment for α FeOOH powder X ray diffraction Rietveld analysis TEM and vibrating sample magnetometer VSM are used to characterize the samples obtained after several milling times Phase identification using Rietveld analysis showed that the goethite is transformed to hematite