Photoacoustic monitoring of magnetite-crystal formation from iron(III) hydroxide acetate: comparison with ESR results

The formation of crystalline magnetite by 1-h heat treatment of iron(III) hydroxide acetate is described. This amorphous-crystalline solid transformation is monitored by electron-spin resonance and photoacoustic spectroscopies. No significant changes were detected for samples heated below 190 °C. Ab...

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Bibliographic Details
Published in:Journal of applied physics 1989-06, Vol.65 (12), p.5150-5153
Main Authors: IACOVACCI, M, DA SILVA, E. C, VARGAS, H, PINHEIRO, E. A, GALEMBECK, F, MIRANDA, L. C. M
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Physics
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:The formation of crystalline magnetite by 1-h heat treatment of iron(III) hydroxide acetate is described. This amorphous-crystalline solid transformation is monitored by electron-spin resonance and photoacoustic spectroscopies. No significant changes were detected for samples heated below 190 °C. Above this temperature both techniques presented results following a definite pattern, namely, the enhancement of ion mobility leading to particle growth and crystallization for a temperature up to 240 °C and the onset of magnetic ordering of magnetite near this temperature.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.343405