Mechanochemical treatment of α-Fe2O3: a neutron diffraction study
Mechanochemical treatment of α-Fe2O3: a neutron diffraction study
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α-Fe2O3 的机械化学处理：中子衍射研究
DOI：
10.1007/s003390101193
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
W. Kaczmarek
中科院分区：
文献类型：
--
作者：
M. Hofmann;S. Campbell;W. Kaczmarek
与早期的研究一致，中子衍射测量表明，非化学计量的fe3 - xo4是赤铁矿α-Fe2O3与缺陷磁铁矿~ Fe2.8O4在真空中湿磨的主要产物，研磨72和144小时后得到。室温中子衍射图的Rietveld细化表明，与化学计量的Fe3O4相比，~ Fe2.8O4的晶格参数（~ 0.1%）和磁矩值（~ 5%）降低。对比研磨72 h试样的相分数（~ 7%）和在~ 950 K下热处理后的相分数（~ 37%），发现研磨产物中有相当一部分α- fe2o3呈无定形或无序状态。
In agreement with earlier studies, neutron diffraction measurements show that off-stoichiometric Fe3-xO4is 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. Rietveld refinements of the room-temperature neutron diffraction patterns show that ∼Fe2.8O4exhibits reduced lattice parameters (∼0.1%) and magnetic moment values (∼5%) compared with stoichiometric Fe3O4. Comparison of the Fe2O3content 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-Fe2O3is present in the milled product in an amorphous-like or disordered state.