Shape-directed modification of truncated octahedral to coffin-like cobalt-doped ferrite particles by changing the hydrothermal reaction conditions.

demonstrated in ageing experiments that akaganeite can be converted into magnetite using NaOH in the presence of Fe( ii ) at temperatures from 25 °C to 100 °C with an increasing trend. 49 At room temperature, this phase conversion needs long reaction times of 720 h.

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In contrast, the AR r values exhibit a decreasing trend in dependence on the widths ( Fig. 5j ) as the AR i for each particle size decreases with the width of the particles for each filling volume (Fig.

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