Journal Article10.1063/1.323611
Effects of grain size on cation ordering in sintered Mg‐ferrites
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TL;DR: In this article, the effects of grain size on the isothermal cation ordering in sintered Mg-ferrites have been studied from 400 to 750°C by thermomagnetic analysis.
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Abstract: The effects of grain size on the isothermal cation ordering in sintered Mg‐ferrites have been studied from 400 to 750 °C by thermomagnetic analysis. The observed dependence of ordering behavior on the grain size as well as on the temperature has proposed that the rate‐determining process changes from nucleation growth to homogeneous ordering as the temperature increases. The high rates of ordering in fine‐grained specimens have been interpreted as due to the increased grain‐boundary areas favorable for nucleation. The apparent activation energy of the homogeneous ordering is 36 kcal/mole in the temperature range between 450 and 600 °C.
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Citations
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References
Numerical Data for Some Commonly Used Solid State Reaction Equations
TL;DR: In this paper, the authors give numerical tables of F(α) in relation to α, and to (t/t0.5) where t 0.5 is the time for 50% reaction and A is a calculable constant depending on the form of F (α).
886
The thermodynamics of cation distributions in simple spinels
Alexandra Navrotsky,O.J. Kleppa +1 more
TL;DR: In this paper, the molar enthalpy of interchange of ions on tetrahedral sites with ions on octahedral sites was calculated from cation distribution data known at a single temperature for each spinel.
584
A Superstructure in Spinels
TL;DR: In this article, the powder diagrams of LiFe5O8 correspond with a primitive cubic lattice with a lattice constant of 8.33 A. Hoffman and E. A. Kordes have shown that the powder diagram of LiAl5O 8 correspond with the cubic lattices of the space group P433 and the positions of the atoms are P413.
Some Properties of Quenched Magnesium Ferrites
D.J. Epstein,B. Frackiewicz +1 more
TL;DR: In this paper, a study of the magnetic properties of quenched magnesium ferrites has been made, including saturation moment, Curie point, initial permeability, and coercive force.
57
Cation Distributions in Nonstoichiometric Magnesium Ferrite
R. L. Mozzi,A. E. Paladino +1 more
TL;DR: In this article, the temperature dependence of the cation distribution parameter, the lattice constant, and the oxygenposition parameter u, for Mg1.06Fe1.94O3.
56