Mechanochemical treatment of α-Fe2O3: A neutron diffraction study

M. Hofmann; S. J. Campbell; W. A. Kaczmarek

doi:10.1007/s003390101193

Mechanochemical treatment of α-Fe₂O₃: A neutron diffraction study

M. Hofmann^*, S. J. Campbell, W. A. Kaczmarek

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

In agreement with earlier studies, neutron diffraction measurements show that off-stoichiometric Fe_3-xO₄ is the main product of wet-milling haematite, α-Fe₂O₃, in vacuum with defect magnetite, ∼ Fe_2.8O₄, being obtained after milling for 72 and 144 h. Reitveld refinements of the room-temperature neutron diffraction patterns show that ∼ Fe_2.8O₄ 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.

Original language	English
Pages (from-to)	S1233-S1235
Journal	Applied Physics A: Materials Science and Processing
Volume	74
Issue number	SUPPL.II
DOIs	https://doi.org/10.1007/s003390101193
Publication status	Published - Dec 2002

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title = "Mechanochemical treatment of α-Fe2O3: A neutron diffraction study",

abstract = "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.",

author = "M. Hofmann and Campbell, \{S. J.\} and Kaczmarek, \{W. A.\}",

year = "2002",

month = dec,

doi = "10.1007/s003390101193",

language = "English",

volume = "74",

pages = "S1233--S1235",

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}

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 - https://www.scopus.com/pages/publications/0036999494

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 -

Mechanochemical treatment of α-Fe₂O₃: A neutron diffraction study

Abstract

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