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- Title
Deformations of the α-Fe<sub>2</sub>O<sub>3</sub> rhombohedral lattice across the Néel temperature.
- Authors
Fabrykiewicz, P.; Stękiel, M.; Sosnowska, I.; Przeniosło, R.
- Abstract
High-resolution synchrotron radiation powder diffraction patterns of α-Fe2O3 measured between room temperature and 1100 K, i.e. above the Né el temperature TN = 950 K, have been analyzed. The integral breadths of the Bragg peaks show a hkl-dependent anisotropy, both below and above TN. This anisotropy can be quantitatively described by using a statistical peakbroadening model [Stephens (1999). J. Appl. Cryst. 32, 281]. Model calculations show that the rhombohedral α-Fe2O3 lattice is deformed and the deformation leads to a monoclinic lattice with the unique monoclinic axis along the hexagonal [110] direction both below and above TN. The monoclinic symmetry of bulk α-Fe2O3 is compatible with α-Fe2O3 nanowire growth along the [110] direction reported in Fu et al.
- Subjects
THERMAL stresses; HEMATITE; ISOTHERMAL processes
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2017, Vol 73, Issue 1, p27
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520616017935