Effects of zinc loss on the magnetic properties of plasma-sprayed MnZn ferrites

Energy dispersive X-ray analysis performed on plasma-sprayed MnZn ferrite (MZF) single `splats' shows a variation in zinc content within splats of different sizes after the spray process, even though the powder has the same starting stoichiometry. A simple model indicates that smaller particles...

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Bibliographic Details
Published in:Acta materialia 2004-06, Vol.52 (11), p.3347-3353
Main Authors: Yan, Q, Gambino, R.J, Sampath, S, Lewis, L.H, Li, L, Baumberger, E, Vaidya, A, Xiong, H
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
MnZn ferrite
Physics
Plasma spray
Splat
Spray coating techniques
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Summary:Energy dispersive X-ray analysis performed on plasma-sprayed MnZn ferrite (MZF) single `splats' shows a variation in zinc content within splats of different sizes after the spray process, even though the powder has the same starting stoichiometry. A simple model indicates that smaller particles have a higher zinc evaporation rate during the in-flight time. However, the significant decrease of zinc in smaller ferrite particles is mainly attributed to their large surface-to-volume ratio. Compositional differences due to a random cation distribution condition results in magnetic property variations among MZF splats. The coating inhomogeneity due to zinc loss increases the coercivity of the plasma-sprayed MnZn ferrites. The magnetic properties of the MnZn ferrites can be improved through long-range (diffusion) and short-range (ordering) cation redistribution upon low temperature annealing.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2004.03.032