Nanocrystalline/Nanosized Mixed Nickel-Manganese Ferrites Obtained by Mechanical Milling

Abstract:

A sum of mixed nickel-manganese ferrites, Ni_xMn_1-xFe₂O₄ (x=0, 0.3, 0.5, 0.7) were synthesized by classical ceramic route starting from stoichiometric mixtures of commercially MnO₂, NiO and Fe₂O₃. The polycrystalline ferrites obtained by ceramic route were subjected to the mechanical milling procedure in order to reduce the particles size and to refine de crystallites size. A planetary high energy ball mill Fritch Pulverisette 4 was used and the milling time was up to 120 minutes. The ceramic and as-milled ferrites samples were investigated by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and laser particles size analysis (LPSA). After 15 minutes of milling the mean crystallites size for each one of the nickel-manganese ferrites is in nanometric range. After 120 minutes of mechanical milling for all ferrites types the mean crystallites size is at 6-8 nm, depending on Ni/Mn ratio. According to the SEM and LPSA investigations the milled ferrites powders consists in nanometric particles alongside of the micrometric ones. The micrometric particles are formed by multiple nanocrystallites.

• Periodical: Solid State Phenomena (Volume 216)
• Pages: 243-248
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.216.243
• Online since: August 2014
• Authors: Ionel Chicinaş*, Traian Florin Marinca, Bogdan Viorel Neamţu, Florin Popa, Olivier Isnard
• Keywords: Magnetic Material, Mechanical Milling, Nanocrystalline/Nanosized, Nickel-Manganese Ferrite

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