Maghemite


Also found in: Wikipedia.

maghemite

[mag′he‚mīt]
(mineralogy)
γ-Fe2O3 A mineral form of iron oxide that is strongly magnetic and a member of the magnetite series.

Maghemite

 

a mineral, a magnetic modification of the ferric oxide γ — Fe2O3. Generally containing admixtures of FeO and TiO2, maghemite is unstable in the natural state and is readily converted into stable hematite. It crystallizes in the tetragonal (pseudoisometric) system characterized by a defective spinel structure of the magnetite type. Maghemite has a hardness of 5-6 on Mohs’ scale and a density of 4,700-4,900 kg/m3. It is opaque and has a dark brown color with a steel-like hue. Maghemite occurs in nature only in the form of microscopically fine depositions in magnetite oxidation products and in titanomagnetite (with hematite, iron hydroxides). It is sometimes found in limonite and laterite as the product formed during the surface weathering of minerals containing iron.

Mentioned in ?
References in periodicals archive ?
The so-called MNPs usually consist of nanoparticles with a magnetic core composed of magnetite (Fe[sub]3O[sub]4) or maghemite (Fe[sub]2O[sub]3), containing of a type of product termed superparamagnetic iron oxide nanoparticles (SPIONs).
Imaging Gliomas with Nanoparticle-Labeled Stem Cells
Lo, Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles, Water Res.
Synthesis of Fe3O4 Magnetic Nanoparticles and Investigation of Removal Capacity
Completely filling anodic aluminum oxide with maghemite nanoparticles by dip coating and
Fluorescent nanodiamond array deposition on porous anodized aluminum oxide using asperity assisted capillary force assembly
Na, "Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process," Journal of the American Chemical Society, vol.
Una guia para el estudio de nanoparticulas magneticas de oxidos de hierro con aplicaciones biomedicas. Parte II
In this paper, the particle size and morphology of the maghemite and dextran coated maghemite was evaluated by dynamic light scattering (DLS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM).
Ultrasound studies on magnetic fluids based on maghemite nanoparticles
Among them, hematite, magnetite and maghemite nanoparticles have particularly promising properties for biomedical applications.
Magnetic Nanoparticles Show Promise in Biomedical Applications
In first category magnetite (Fe3O4) and maghemite (Fe2O3) are included.
Magnetic hyperthermia
Allen, Vibrational spectroscopic characterization of hematite, maghemite and magnetite thin films produced by vapour deposition, ACS appl.
Iron incorporated hydroxyapatite for orthopaedic applications: its synthesis, characterization and biocompatibility studies
181) These are then aged and oxidized to form small, dispersed maghemite spheres.
Nanoparticulate inorganic UV absorbers: a review
magnetite and maghemite, are the most frequently used because of their generally suitable magnetic properties and biological compatibility.
Numerical simulation of particle movement in cellular flows under the influence of magnetic forces
Hematite and goethite are the predominant pedogenic Fe oxides, followed by maghemite and ferrihydrite, and gibbsite is Al oxide.
Mineralogy and phosphorus adsorption in soils of south and central-west Brazil under conventional and no-tillage systems/Mineralogia e adsorcao de fosforo em solos sob preparo convencional e plantio direto nas regioes sul e centro-oeste do Brasil
2007): "The Preparation of Magnetite, Goethite, Hematite and Maghemite of Pigment Quality from Mill Scale Iron Waste", Dyes and Pigments, 74, pp.
El Arte Rupestre Esquematico del Arroyo Barbaon (Parque Nacional de Monfrague, Caceres): contextualizacion arqueologica y caracterizacion de pigmentos

Encyclopedia browser ?
Full browser ?