Physics – Condensed Matter – Materials Science
Scientific paper
2006-04-28
Physics
Condensed Matter
Materials Science
34 pages, 12 figures, submitted to Chemistry of Materials
Scientific paper
The crystal and magnetic structures of the orthorhombic e-Fe2O3 have been studied by simultaneous Rietveld refinement of X-ray and neutron powder diffraction data in combination with Mossbauer spectroscopy, as well as magnetisation and heat capacity measurements. It has been found that above 150 K the e-Fe2O3 polymorph is a collinear ferrimagnet with the magnetic moments directed along the a axis, while the magnetic ordering below 80 K is characterised by a square-wave incommensurate structure. The transformation between these two states is a second order phase transition and involves subtle structural changes mostly affecting the coordination of the tetrahedral and one of the octahedral Fe sites. The temperature dependence of the e-Fe2O3 magnetic properties is discussed in the light of these results.
Ardisson J. D.
Frontera Carlos
Gich Martí
Hardy Vincent
Macedo W. A. A.
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