Transformation of Goethite to Hematite Nanocrystallines by High Energy Ball Milling

Table 2

Magnetic parameters obtained from VSM measurements.

Milling time; (hours)	Magnetic behavior	Hc; (Oe)	Mr; (memu/g)	or Ms; (emu/g)
0	Paramagnetic	66.14	1.381	180.9 × 10^−3
5	Ferromagnetic	49.52	289.8	8.509
10	Ferromagnetic	91.60	106.0	1.798
40	Ferromagnetic	91.66	496.8	6.715