Ontology type: schema:Chapter
2005
AUTHORSJ. F. Bengoa , M. S. Moreno , S. G. Marchetti , R. E. Vandenberghe , R. C. Mercader
ABSTRACTWe have studied the Morin transition in nanostructured pseudocubic α-Fe2O3 particles of about 1.8 mm side. The preparation was carefully chosen to obtain a system with a very narrow crystallite size distribution and particles of homogeneous morphology. Two samples were studied: one without thermal treatment (α-Fe2O3(ap)) and another annealed at 673 K in air for 12 h (α-Fe2O3(an)). Both were characterized by XRD, SEM, TGA and Mössbauer spectroscopy. The results indicate that the Morin transition is suppressed for α-Fe2O3(ap), however, a-Fe2O3(an) has a T M ≈ 230 K and the transition is completed over a very narrow temperature range. These results are discussed in connection with the crystallite size, the cell parameters, and the presence of OH− groups (hydrohematite) or incorporated water (protohematite). More... »
PAGES177-183
LACAME 2004
ISBN978-3-540-28959-3
http://scigraph.springernature.com/pub.10.1007/3-540-28960-7_19
DOIhttp://dx.doi.org/10.1007/3-540-28960-7_19
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