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Type: Artigo de periódico
Title: Magnetite Crystal Formation From Iron(iii) Hydroxide Acetate. An Esr Study
Author: Pinheiro E.A.
De Abreu Filho P.P.
Galembeck F.
Da Silva E.C.
Vargas H.
Abstract: Crystalline Fe3O4, magnetite, can be obtained by heating noncrystalline iron(III) hydroxide acetate (IHA). The inception of this amorphous-crystalline solid transformation was monitored by ESR spectroscopy, at various temperatures. No spectral changes are detected by heating samples for up to 2 h at temperatures below 190°C. Above this temperature the spectra change following a definite pattern: line widths increase at first and decrease at longer times until a steady value is reached; line-width decrease is faster at higher temperatures. ESR line intensities show little change at short heating times but they increase by 1 order of magnitude at longer times. ESR spectra allows the detection of two distinct events in IHA transformation to magnetite: the onset of ion mobility in the amorphous solid and (later) of magnetic ordering. © 1987 American Chemical Society.
Rights: fechado
Identifier DOI: 
Date Issue: 1987
Appears in Collections:Unicamp - Artigos e Outros Documentos

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