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Figure 2.2 Two types of nanoparticulate Fe2O3 powder
) (b) Nanoparticulate powder
Among all of the processes used to produce nanoparticulate powders, the ?
is usually positive, there is a rule that melting temperatures will decrease with decreasing particle size and this has severe consequences for phase diagrams of nanoparticulate materials.
In Figure 7.15, the lattice parameter of nanoparticulate BaTiO3 (a ferroelectric material with a perovskite structure) is displayed as a function of the annealing temperature As for the cases discussed above, at small particle size BaTiO3 crystallizes
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