Transformation of Goethite to Hematite Nanocrystallines by High Energy Ball Milling

Table 1

Microstructural parameters as obtained from Rietveld refinements.

Milling time; (hours)	Phases	Amount; (%)	Crystallite size; (nm)	Strain; (%)	Lattice parameters
5	-Fe2O3	54	8	0.330	= 5.019 (2)	= 13.704 (8)
	-Fe(OH)	33	53	0.870	= 5.039 (7)	= 4.452 (5)	= 2.933 (3)
	Fe	13	41	0.760	= 2.862 (1)
10	-Fe2O3	66.3	11	0.330	= 5.024 (1)	= 13.717 (4)
	-Fe(OH)	33.7	36	0.950	= 5.094 (5)	= 4.438 (3)	= 3.058 (3)
40	-Fe2O3	87.6	10	0.140	= 5.026 (1)	= 13.716 (3)
	Fe	12.4	14	0.532	= 2.873 (1)