Journal article
The thermal conversion of lepidocrocite (gamma-FeOOH) revisited
In
Journal of Thermal Analysis and Calorimetry
—
2001, Volume 64, Issue 3, pp. 1303-1310
Abstract
The thermal conversion of lepidocrocite (γ-FeOOH) into maghemite (γ-Fe2O3)and hematite (α-Fe2O3) has been studied by dynamic (DSC) and static heating experiments. Dynamic heating defines two main regions: conversion of lepidocrocite to maghemite (endothermal signal peaking at 255°C) and conversion of maghemite to hematite (exothermal signal peaking at 450°C).
In addition, an exotherm following the lepidocrocite to maghemite endotherm is observed. The maghemite phase appears as porous aggregates of nanocrystals characterized by an extensive spin-canting. We suggest that the additional exotherm is associated with structural changes and a decreasing extent of spin-canting in the maghemite phase.
| Language: | English |
|---|---|
| Publisher: | Kluwer Academic Publishers |
| Year: | 2001 |
| Pages: | 1303-1310 |
| Journal subtitle: | An International Forum for Thermal Studies |
| ISSN: | 15728943 , 14182874 , 03684466 , 13886150 and 15882926 |
| Types: | Journal article |
| DOI: | 10.1023/A:1011582004634 |
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