Journal of the Physical Society of Japan · 1962 · 98 citations · 10 references
Natural SciencesMaterials EngineeringMaterials ScienceCondensed Matter PhysicsMagnetic MaterialsSolid-state ChemistryIron OxidesMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsMagnetism Of Inorganic CompoundsPhase TransitionsHematiteMagnetic MineralsMagnetic PropertiesMagnetization CurvesMineral Magnetic PropertiesPhase Transition TemperatureSuperexchangeSuperexchange Mechanism
The magnetic properties of FeTiO 3 containing less than 50 mole percent of Fe 2 O 3 have been re-examined between 2°K and room temperature by means of a Cioffi-type automatic fluxmeter. It was confirmed that each specimen has a low-temperature transition point, which decreases in temperature with increasing content of Fe 2 O 3 . Above the transition temperature the specimens with 8 and 12 mole % Fe 2 O 3 show superparamagnetic behavior. By analysis of the superparamagnetic magnetization curves, the sizes of the superparamagnetic clusters were determined. The average size of clusters in these crystals is found to be explained by a simple assumption that one Fe 3+ ion which enters into the Ti layers of ilmenite alignes the spins of 9 nearest neighbour Fe ions parallel by a superexchange interaction. The complete phase diagram of the ilmenite rich side of the solid solution, as revised by the present study, is presented.
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Neutron Diffraction Studies on Iron at High Temperatures
M. Wilkinson, C. G. Shull · Physical Review · 1956 · 71 citations