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Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... ( mg / kg ) Price [7] Year Source Notes USD/kg USD/L [c] 1: H: Hydrogen ...
Magnetite crystals with a cubic habit are rare but have been found at Balmat, St. Lawrence County, New York, [47] [48] and at Långban, Sweden. [49] This habit may be a result of crystallization in the presence of cations such as zinc. [50] Magnetite can also be found in fossils due to biomineralization and are referred to as magnetofossils. [51]
Hematite - titanomagnitite. Titanomagnetite is a mineral containing oxides of titanium and iron, with the formula Fe 2+ (Fe 3+,Ti) 2 O 4.It is also known as titaniferous magnetite, mogensenite, Ti-magnetite, or titanian magnetite. [1]
When smelted for steel, 1,000 lb (450 kg) of sand yielded about 100 lb (45 kg) of steel, 100 lb (45 kg) of slag, and 90 lb (41 kg) of pig iron. Slag and pig iron that were not suitable for use were then melted together to form wrought iron, of which 1,000 lb (450 kg) mixed produced about 500 lb (230 kg) of iron.
The oldest known magnetic substance, magnetite (Fe 3 O 4), is ferrimagnetic, but was classified as a ferromagnet before Louis Néel discovered ferrimagnetism in 1948. [2] Since the discovery, numerous uses have been found for ferrimagnetic materials, such as hard-drive platters and biomedical applications.
Generally, most magnetite banded iron formation deposits must be ground to between 32 and 45 μm (0.0013 and 0.0018 in) in order to produce a low-silica magnetite concentrate. Magnetite concentrate grades are generally in excess of 70% iron by weight and usually are low in phosphorus, aluminium, titanium, and silica and demand a premium price.
M is the magnetization of the material (the magnetic dipole moment per unit volume), with unit amperes per meter, and; H is the magnetic field strength, also with the unit amperes per meter. χ v is therefore a dimensionless quantity. Using SI units, the magnetic induction B is related to H by the relationship
Accordingly, physicists and engineers usually define magnetization as the quantity of magnetic moment per unit volume. [1] It is represented by a pseudovector M . Magnetization can be compared to electric polarization , which is the measure of the corresponding response of a material to an electric field in electrostatics .