Iron ferrite

Feltin N and Pileni M P 1997 New teohnique for synthesizing iron ferrite magnetio nanosized partioles Langmuir "[Z 3927... 

A number of ferrites have been subjected to shock modification and studied with x-ray diffraction as well as static magnetization and Mossbauer spectroscopy [87V01], Studies were carried out on cobalt, nickel, and copper ferrites as well as magnetite (iron ferrite). 

Figs. 20.45fl and b, respectively. It follows from the diagrams that Ni and C are austenite (7-phase) stabilisers while Cr is a ferrite (a-phase) stabiliser. The fact that the interstices in an f.c.c. structure are bigger than those in a b.c.c. structure accounts for the fact that C is much more soluble in f.c.c. iron (austenite) than in b.c.c. iron (ferrite) (Fig. 20.44). 

Marin IVL, Ortuno M, Hernandez A, Abelian J (1990) Peicolative treatment of the Verwey transition in cobalt-iron and nickel-iron ferrites. Physica Status Solidi (B) 157 275-280 McElhiimy MW, McFadden PL (1999) Paleomagnetism. Academic Press, New York McVitie S, Chapman JN (1995) Coherent Lorentz imaging of soft thin-film magnetic materials. Mater Res Soc Bull, October 1995 55-58... 

In BCC structures, the twin plane is (112) and the twinning shear is in the direction [llT]. The only common example of such twins is in a-iron (ferrite) deformed by impact, where they occur as extremely narrow twin bands called Neumann bands. It should be noted that, in cubic lattices, both 112 and 111 reflection twinning produce the same orientation relationship however, they dilfer in the interatomic distances produced, and an FCC lattice can twin by reflection on 111 with less distortion than on 112, while for the same reason 112 is the preferred plane for BCC lattices. 

Single metals and alloys such as wrought iron, bronze and lead will corrode even though they are not joined to a different metal or alloy. In reality, anodes and cathodes are set up on the surface of the metal. This will be due to the different phases present in the alloy, e.g. iron (ferrite) will be the anode and graphite the cathode in a cast iron, impurities such as sulfides present in wrought iron and variation in the copper/zinc ratio in adjacent grains in a brass alloy. The reactions taking place on the anode and cathode will be the same except the anode may be a different metal if the object was not iron. With a copper artefact, for example, the anode reaction will be ... 

Galt, J. K. (1954). Motion of individual domain walls in nickel-iron ferrite. Bell System Technical Journal, 33, 1023-54. 

Hydrogen transport in a metal can occur by lattice diffusion, dislocation motion, or short-circuit diffusion along grain boundaries. Hydrogen can diffuse rapidly through the lattice in many metals, particularly those with a body-centered cubic (bcc) structure such as a-iron, ferritic steels, and )3-titanium alloys. However, grain boundary diffusion and dislocation... 

J. Tsagaroyannis, K.-J. Haralambous, Z. Loizos, G. Petroutsos, N. Spyrellis, Gadolinium-iron ferrites catalytic effect on the water-gas shift reaction. Mater. Lett. 28 (1996) 393-400. 

Feltin, N., Pileni, M.P. New technique for synthesizing iron ferrite magnetic nanosized particles. Langmuir 13, 3927-3933 (1997)... 

Iron ferrites were synthesized [280] by solubilizing ferrous dodecyl sulfate in an aqueous solution as an O/W micellar solution and methylamine was added to it. The liquid was stirred at 50°C for 3 h when precipitation occurred. The average size of the highly crystalline product was 3.7-11.6 nm. 

Heat-resistant white irons Ferritic grade Austenitic grade Where a single value is given rather than a range, that value is Total carbon... 

Fig. 1.58 Micro cracks density in a-iron (ferrite) at two strain amplitudes vs. relative fatigue life [79]...

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