TY - JOUR
T1 - Mechanochemical treatment of α-Fe2O3
T2 - A neutron diffraction study
AU - Hofmann, M.
AU - Campbell, S. J.
AU - Kaczmarek, W. A.
PY - 2002/12
Y1 - 2002/12
N2 - In agreement with earlier studies, neutron diffraction measurements show that off-stoichiometric Fe3-xO4 is the main product of wet-milling haematite, α-Fe2O3, in vacuum with defect magnetite, ∼ Fe2.8O4, being obtained after milling for 72 and 144 h. Reitveld refinements of the room-temperature neutron diffraction patterns show that ∼ Fe2.8O4 exhibits reduced lattice parameters (∼0.1%) and magnetic moment values (∼5%) compared with stoichiometric Fe3O4. Comparison of the Fe2O3 content as determined from the phase fractions of the 72-h milled sample (∼ 7%) and following heat treatment at ∼ 950 K (∼37%) reveals that a significant fraction of α-Fe2O3 is present in the milled product in an amorphous-like or disordered state.
AB - In agreement with earlier studies, neutron diffraction measurements show that off-stoichiometric Fe3-xO4 is the main product of wet-milling haematite, α-Fe2O3, in vacuum with defect magnetite, ∼ Fe2.8O4, being obtained after milling for 72 and 144 h. Reitveld refinements of the room-temperature neutron diffraction patterns show that ∼ Fe2.8O4 exhibits reduced lattice parameters (∼0.1%) and magnetic moment values (∼5%) compared with stoichiometric Fe3O4. Comparison of the Fe2O3 content as determined from the phase fractions of the 72-h milled sample (∼ 7%) and following heat treatment at ∼ 950 K (∼37%) reveals that a significant fraction of α-Fe2O3 is present in the milled product in an amorphous-like or disordered state.
UR - http://www.scopus.com/inward/record.url?scp=0036999494&partnerID=8YFLogxK
U2 - 10.1007/s003390101193
DO - 10.1007/s003390101193
M3 - Article
SN - 0947-8396
VL - 74
SP - S1233-S1235
JO - Applied Physics A: Materials Science and Processing
JF - Applied Physics A: Materials Science and Processing
IS - SUPPL.II
ER -