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Neutron Diffraction Study of Mesoporous and Bulk Hematite, α-Fe2O3
Abstract
Variable temperature neutron diffraction was carried out on mesoporous α-Fe 2 O 3 (hematite) with a mean pore diameter of 38.5 Å. Data were directly compared to measurements carried out on bulk hematite. Unlike bulk hematite, the mesoporous material does not undergo a spin−flop transition from a weak ferromagnet to a pure antiferromagnet (Morin transition, T M = 259.1(2)). Instead, the material remains a weak ferromagnet down to 2 K with the magnetic moments staying perpendicular to the R 3̅ c [111] ([003] in the hexagonal cell) direction rather than realigning (to) almost parallel to this direction. The angle of the magnetic Fe 3+ moments to the [111] direction in the antiferromagnetic state also accurately was obtained for bulk hematite. Using magnetic hysteresis measurements, the canting angle responsible for weak ferromagnetism within the ab planes (hexagonal setting) was deduced for the mesoporous material at 12 K and compared to the angle made in bulk hematite above T M .
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Citations
Cites
Anisotropic Superexchange Interaction and Weak Ferromagnetism
Moriya, T. (1960) · Physical Review · doi:10.1103/physrev.120.91 · Cited by 7,234
Generalized syntheses of large-pore mesoporous metal oxides with semicrystalline frameworks
Yang, P., Zhao, D., Margolese, D. I., Chmelka, B. F., & Stucky, G. D. (1998) · Nature · doi:10.1038/24132 · Cited by 2,493
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Ordered mesoporous metal oxides: synthesis and applications
Ren, Y., Ma, Z., & Bruce, P. G. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35086f · Cited by 768
Self-citationExfoliation of a non-van der Waals material from iron ore hematite
Puthirath Balan, A., Radhakrishnan, S., Woellner, C. F., Sinha, S. K., Deng, L., Reyes, C. D. L., Rao, B. M., Paulose, M., Neupane, R., Apte, A., et al. (2018) · Nature Nanotechnology · doi:10.1038/s41565-018-0134-y · Cited by 423
Pollastri, S., D’Acapito, F., Trapananti, A., Colantoni, I., Andreozzi, G. B., & Gualtieri, A. F. (2015) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2015.05.010 · Cited by 51
Metadata
- Authors
- Hill, A. H., Jiao, F., Bruce, P. G., Harrison, A., Kockelmann, W., & Ritter, C.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-07-08
- Volume
- 20
- Issue
- 15
- Pages
- 4891-4899
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W1984745033
- Cited by
- 190
- References
- 2
- FWCI
- 2.45
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hill, A. H., Jiao, F., Bruce, P. G., Harrison, A., Kockelmann, W., & Ritter, C. (2008). Neutron Diffraction Study of Mesoporous and Bulk Hematite, α-Fe2O3. Chemistry of Materials. https://doi.org/10.1021/cm800009s
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