Study of the Morin Transition in Pseudocubic α-Fe2O3 Particles View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2005-02

AUTHORS

J. F. Bengoa, M. S. Moreno, S. G. Marchetti, R. E. Vandenberghe, R. C. Mercader

ABSTRACT

We have studied the Morin transition in nanostructured pseudocubic α-Fe2O3 particles of about 1.8 μm 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, α-Fe2O3(an) has a TM ≈ 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... »

PAGES

177-183

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10751-005-9180-6

DOI

http://dx.doi.org/10.1007/s10751-005-9180-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004010230


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