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|Type:||Artigo de periódico|
|Title:||Magnetite Crystal Formation From Iron(iii) Hydroxide Acetate. An Esr Study|
De Abreu Filho P.P.
Da Silva E.C.
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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