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Highly crystalline porous magnetite and vacancy-ordered maghemite microcrystals of rhombohedral habit

July 11, 2013, 6:14 am
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Publication date: 1 October 2013
Source:Journal of Crystal Growth, Volume 380
Author(s): Aurel Ercuta , Marius Chirita
Porous crystals of magnetite and vacancy-ordered maghemite, rhombohedron-shaped, reaching 150μm in size, and having remarkably large specific surface area (88.55m2/g for magnetite, 40.14m2/g for maghemite) were obtained via topotactical conversion, starting from hydrothermally grown siderite single crystals. The increase in density (from 3.9g/cm3 for siderite to 5.24g/cm3 for magnetite and 4.9g/cm3 for maghemite) caused quasi-ordered internal pores-grains pattern, with mesocrystalline appearance. The X-ray Line-Profile Fitting-based microstructure analysis gave 64±6nm and 84±8nm for the average inner grains size in magnetite and maghemite. Structure and phase content analysis indicated high purity and crystallinity. Magnetic measurements indicated saturation magnetization (92.1emu/g for magnetite and 85.5emu/g for maghemite) approaching the upper limits reported for the pure bulk oxides.

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