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Topic: Maghemite

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	Maghemite - Wikipedia, the free encyclopedia
		Maghemite (Fe, γ-Fe) is a member of the family of iron oxides.
		It has the same structure as magnetite, that is, it is spinel ferrite and is also ferrimagnetic.
		Maghemite is formed by the topotactic oxidation of magnetite.
	en.wikipedia.org /wiki/Maghemite (90 words)

	maghemite
		The abundance of water on Earth has converted much of the maghemite into a noncatalytic form, but on Mars it has survived virtually unaltered.
		It was cited by Vance Oyama in his explanation of the results of the Viking labeled release (LR) experiment (see Oyama's hypothesis, about the active nature of the Martian soil).
		Synthetic maghemite is being studied as part of an electrically conductive and magnetizable film in nanocomposite structures.
	www.daviddarling.info /encyclopedia/M/maghemite.html (200 words)

	Study of Superparamagnetic Relaxation in Nanophase Maghemite
		Maghemite is a ferromagnetic iron oxide crystal that has many applications in the magnetic recording media.
		Nanophase maghemite, often found in the corrosion coatings of atmospherically exposed structural steels, has particle size of the order of 10-20 nm and exhibit superparamagnetic behavior.
		In order to characterize the superparamagnetic behavior of maghemite, and to estimate the anisotropy constant as a function of particle volume, synthetic nano-crystals of Maghemite of different particle sizes were produced.
	www.foresight.org /Conferences/MNT10/Abstracts/Hale (203 words)

	CHARACTERISTICS AND GENESIS OF MAGHEMITE IN LOESS-PALEOSOL SEQUENCES OF CHINA
		Our results indicate that maghemite in loess-paleosol layers were transformed from oxidation of sub-micrometer scale magnetite, and the nanometer scale magnetite was mainly resulted from microbial activities.
		The oxidation of sub-micrometer size magnetite into maghemite nanocrystal is responsible for paleosol susceptibility enhancement, because the nanostructured iron oxide minerals have abnormal high susceptibility.
		This investigation also suggests that nanometer maghemite is more stable than hematite because the maghemite has lower surface energy than that of hematite, according to the results of McHale for surface energies and thermodynamic phase stability in nanocrystalline alumina.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_77176.htm (349 words)

	Investigation into the Origin of Magnetic Soils on the Oak Ridge Reservation, Tennessee -- Rivers et al. 68 (5): 1772 ...
		X-ray diffraction analysis of the (A) sand fraction and the (B) silt fraction from the magnetic and nonmagnetic soils.
		X-ray diffraction analysis of magnetically separated grains from the sand fraction of the magnetic soil (vertical axis is intensity [CPS]).
		The magnetic grains are aggregates of both maghemite and hematite.
	soil.scijournals.org /cgi/content/full/68/5/1772 (3527 words)

	Characterization of the system maghemite H+ water
		This thesis is a summary of several synthesis pathways of the iron oxide maghemite (gamma-Fe2O3).
		A second part describes the characterization of the produced maghemite used in the third part via BET-measurement of the specific surface area, X-ray powder diffraction and IR-spectroscopy.
		This third part examines the acid-base properties of the system maghemite H+ water.
	epubl.luth.se /1402-1552/2002/25/index-en.html (74 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		Maghemite is formed either by the oxidation of magnetite or by the thermal dehydration of lepidocrosite.
		The X-ray patterns confirmed the identity of the sample and the TEM data indicated that the sample was well crystallized.
		References: Maghemite C (JCPDS 39-1346), Maghemite Q (JCPDS 12-1402) and Magnetite (Huebner's reference patterns).
	speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/maghemite.gds81.html (196 words)

	Table T3. X-ray diffraction results and carbonate contents (CaCO3) for Hole 1139A, Unit II. (Site not responding. Last check: 2007-10-12)
		Clay, sanidine, calcite, maghemite, pyrite, plagioclase?, quartz, (glauconite), chlorite
		Calcite, clay, sanidine, maghemite, plagioclase?, (glauconite, pyrite, quartz)
		Calcite, clay, sanidine, maghemite, glauconite, (clinoptilolite, pyrite, plagioclase?)
	www.ga.gov.au /odp/publications/183_SR/010/010_t3.htm (99 words)

	Mineralogy of a burned soil compared with four anomalously red Quaternary deposits in Denmark -- NØRNBERG et al. ...
		Hematite and maghemite occur in Salten Skov, Salten
		The presence of hematite and maghemite in the four Fe oxide
		Stanjek H. (1987) The formation of maghemite and hematite from lepidocrocite and goethite in a Cambisol from Corsica, France.
	claymin.geoscienceworld.org /cgi/content/full/39/1/85 (2972 words)

	[No title]
		ÐÏà¡±á>þÿ "$þÿÿÿ!ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á ¿ jbjbjªjª "ÈÈÿÿÿÿÿÿ]ÈÈÈÈÈ Ô ÈËìììììììì,Ë ô¿è¶ììììì¶$ììì$$$ì.ìì¬ºì$d$à ZæB¹ÈÈ Study of Superparamagnetic Relaxation in Nanophase Maghemite Simon Hale, Rama Balasubramanian Department of Physics, James Madison University, Harrisonburg, VA 22807 Maghemite is a ferromagnetic iron oxide crystal that has many applications in the magnetic recording media.
		The crystals were precipitated from an aqueous solution of FeCl3-FeCl2 by varying the pH level of the solution under a controlled oxidization rate.
		Detailed spectroscopic results on the magnetic and crystalline properties of nanophase maghemite will be presented.
	www.foresight.org /conference/MNT10/Abstracts/Hale/Hale.doc (218 words)

	[No title]
		Estimation of the surface and bulk thermodynamic properties of ordered and disordered maghemite (gamma-Fe 2 O 3).
		Alain Manceau, Bruno Lanson and Victor A. Drits Structure of heavy metal sorbed birnessite.
		to be due to the maghemite to magnetite transition...
	info.geol.msu.ru /db/geol_search?q=MAGHEMITE (737 words)

	Table T8. Petrographic summary of the opaque mineralogy of basement rocks, Site 1204. (Site not responding. Last check: 2007-10-12)
		~70% altered; maghemite is pervasive, but a few crystals have relict centers
		Almost completely replaced by maghemite; rare relict Ti-Mag areas parallel to cleavage planes are present
		Highly altered to maghemite; only larger crystals have relict Ti-Mag centers; the majority of the crystals are
	www.ga.gov.au /odp/publications/197_IR/chap_04/c4_t8.htm (411 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Energy Citations Database (ECD) Document #5352547 - Unusual occurrence of maghemite in soils developed on Knox group dolostones
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Unusual occurrence of maghemite in soils developed on Knox group dolostones
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=5352547 (136 words)

	Ultrafine maghemite particles. II. The spin-canting effect revisited
		The magnetic structure of ultrafine maghemite particles was studied by Mossbauer spectroscopy.
		We have compared the degree of spin alignment obtained in applied magnetic fields in particulate samples with different frozen-in orientational distributions of the easy directions of the magnetization.
		In particular, reselling and systematic downloading of files is prohibited.
	stacks.iop.org /0953-8984/6/3091 (187 words)

	Maghemite Mineral Data
		Standardized Intensity (100%) Reflection Spectra of Maghemite in Air
		Calculated Relative Intensity Colors of Maghemite in Air
		Print or Cut-and-Paste your Maghemite Specimen Label here :
	webmineral.com /data/Maghemite.shtml (256 words)

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