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Jul 01, 2006 The energetics of magnetic and cation ordering have been modeled using an atomistic approach based on empirical exchange interaction parameters. The model has been applied to the study of magnetic and cation ordering in the ilmenite-hematite solid solution via Monte Carlo simulations, providing new insight into the effect of nanoscale ...
Sep 10, 2011 Ternary plot of the hematite-ilmenite-magnetite composition of oxide grains based on assumptions and field-cooled remanence experiments. Group 1 (blue squares) has the least variability and is dominated by hematite. Groups 2 (green triangles) and 3 (red circles) have greater variability, with more magnetite than group 1.
In order to distinguish between these two hypotheses we conducted rock magnetic experiments on single crystals of finely-exsolved hematite-ilmenite along a transect approaching the Quottoon Pluton. Reflected light, and SEM observations show grains of hematite and ilmenite as the dominant Fe-oxide throughout the Ecstall.
The opaque minerals in ten lava flows of the Keweenawan series of Michigan were studied microscopically by the writer. The basaltic lavas, which range in thickness from 100 to 1,400 feet, contain ilmenite, magnetite, hematite, intergrowths of magnetite-ilmenite and ilmenite-hematite, copper sulfides, native copper, and pyrite.
interfaces between fine precipitates of ilmenite and hematite. Grains of finely exsolved hematite– ilmenite (Fe2O3–FeTiO3) have been shown to carry a strong and extremely stable remanent magnetization, suggesting an explanation for some magnetic anomalies in the deep Earth and on planetary bodies that no longer retain a magnetic field [3-6].
Five main microstructural features characterize hematite-ilmenite intergrowths from the Ecstall: (I) exsolution lamellae of hematite and ilmenite; (II) oxidation of ilmenite to form hematite, rutile, and other Ti-rich phases; (III) 20-50 nm magnetite precipitates in hematite; (IV) rutile blitz texture; and (V) exsolution of hematite in rutile.
Jun 01, 2017 Introduction. The ilmenite-hematite [xFeTiO 3 – (1 – x)Fe 2 O 3] solid-solution series has been studied extensively because of its complex and interesting magnetic and electronic properties.Intermediate compositions are magnetic semiconductors (Ishikawa and Akimoto 1957; Ishikawa 1958) and could conceivably be utilized in spintronics devices (Butler et al. 2003; Fujii et al. …
Magnetite-rutile symplectite derived from ilmenite-hematite solid solution in the Xinjie Fe-Ti oxide-bearing, mafic-ultramafic layered intrusion (SW China) October 2015 American Mineralogist 100
Sample AL36b was chosen particularly because all evidence showed it is free of magnetite that does occur in many Allard Lake samples, and would thus yield clear information on properties purely related to the hematite-ilmenite solid solution. Magnetic data on samples AL20c, AL114, and AL46 from Lac Tio and AL7b from Lac Ellen are also reported. 2.
Jan 28, 2012 Magnetite is an iron oxide with the chemical formula Fe 3 O 4 whereas hematite is an iron oxide with the chemical formula Fe 2 O 3. Magnetite iron is in +2 and +3 oxidation states whereas, in hematite, it is only in +3 oxidation state. This is the key difference between magnetite and hematite. Moreover, magnetite has higher iron content than
Ilmenite, hematite and corundum all have similar structures and belong to a more or less informal group called the Hematite Group with a general formula of A 2 O 3. Ilmenite - Wikipedia. Ilmenite, also known as manaccanite, is a titanium-iron oxide mineral with the idealized formula FeTiO 3.It is a weakly magnetic black or steel-gray solid.
It looks like hematite, for the imitation of which it is used. It differs from hematite with the black drawn line. As inclusions it can be observed in hematite, magnetite, quartz, labradorite and some other gemstones. In Russia, on the Kola Penin., at the deposit Poachvumchorr, Khibiny, the size of ilmenite crystals reached 1 m. in cross-section.
Jun 04, 2020 Addition of magnetite to hematite influences the melting behavior as well as the melt properties. Ilmenite ore has magnetite as one of the major phases, so the melting temperature of the sinter blend might have been increased and this change might affect the assimilation of the Al and Si into the calcium ferrites during the formation of SFCA.
Harrison R J, Redfern S A T (2001) Short- and long-range ordering in the ilmenite-hematite solid solution Physics and Chemistry of Minerals 28 399-412: 2001: 0: 476: 0008560: Ilmenite: Harrison R J, Redfern S A T (2001) Short- and long-range ordering in the ilmenite-hematite solid solution Physics and Chemistry of Minerals 28 399-412: 2001: 0
Two groups of opaque minerals and their alteration products are distinguished. The earlier group includes magnetite, ilmenite, magnetite-ilmenite and ilmenite-hematite intergrowths, copper sulfides, and native copper. The later group includes hematite, native copper, chalcocite, pyrite, chlorite, and sphene.
ILMENITE-HEMATITE-MAGNETITE RELATIONS IN SOME EMERY ORES Josnrn M. Bnav, Mossachwsetls Institwte of Technology, Cambridge, Mass. Alsrnecr The principal mode of occurrence hematite and ilrnenite in emery ores from a num-ber of localities is in the form of unique exsolution intergrowths, suggesting unusual
Dec 01, 2002 X-ray diffraction analyses showed that hematite (α-Fe 2 O 3) was the new phase formed during oxidation roasting of ilmenite. The highest magnetic susceptibility was obtained when the peak intensity ratio between hematite and ilmenite was between 1.5 and 3.5. 4.
The lamellar microstructure observed in the hematite-ilmenite grains, as well as the rutile blitz texture are linked to the thermal history of the Ecstall Pluton, and have important effects on the magnetic properties of these grains (i.e. lamellar magnetism).
Jul 01, 2006 The energetics of magnetic and cation ordering have been modeled using an atomistic approach based on empirical exchange interaction parameters. The model has been applied to the study of magnetic and cation ordering in the ilmenite-hematite solid solution via Monte Carlo simulations, providing new insight into the effect of nanoscale
The opaque minerals in ten lava flows of the Keweenawan series of Michigan were studied microscopically by the writer. The basaltic lavas, which range in thickness from 100 to 1,400 feet, contain ilmenite, magnetite, hematite, intergrowths of magnetite-ilmenite and ilmenite-hematite, copper sulfides, native copper, and pyrite.
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