Abstract
High-density fine-grained Ni0.5Zn0.5Fe2O4 ferrite ceramics were synthesized by spark plasma sintering (SPS) in conjunction with high energy ball milling. The precursor powders were milled for 20 h, 40 h, and 60 h, respectively, and the milled powders were all sintered for 5 min at 900°C. All the samples exhibit a single spinel phase. With increasing of the ball milling time, the relative density of the samples increases (up to 97.7%), however, the grain size decreases (down to ~200 nm). At room temperature, the sample from the 40 h-milled powder has the best combination of saturation magnetization and coercivity (83 emu/g and 15 Oe). These outstanding magnetic properties may be associated with high density and uniform microstructure created by SPS on the basis of fine precursor powders produced by high-energy ball milling.
Highlights
Spinel ferrites constitute an important class of magnetic materials
The aim of the present work is to fabricate a highdensity fine-grained Ni0.5Zn0.5Fe2O4 ferrite material by SPS in conjunction with high-energy ball milling, emphasizing the effect of ball milling on the magnetic properties of resulting ceramics
High-density fine-grained Ni0.5Zn0.5Fe2O4 ferrite ceramics are successfully fabricated by SPS from fine precursor powders created by high-energy ball milling for 20 h, 40 h and 60 h, respectively
Summary
Spinel ferrites constitute an important class of magnetic materials Their applications always demand for highdensity, low-porosity and controlled-microstructure. (2015) Effect of High-Energy Ball Milling on the Magnetic Properties of NiZn Ferrite Ceramics Synthesized by Spark Plasma Sintering. Conventional methods for preparation of ferrites involve high-temperatures and long-reaction times, which would result in coarse-grained microstructures and poor magnetic properties. Conventional sintering for NiZn ferrite preparation usually requires temperatures up to 1300 ̊C for several hours even though small-sized powers are used [2]. High reactivity and small particle size can facilitate the production of highdensity ceramics at low sintering temperatures [8]. The aim of the present work is to fabricate a highdensity fine-grained Ni0.5Zn0.5Fe2O4 ferrite material by SPS in conjunction with high-energy ball milling, emphasizing the effect of ball milling on the magnetic properties of resulting ceramics
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