Microstructures, physical and magnetic properties of BaFe12O19 permanent magnets with the addition of Al2O3-MnO (original) (raw)
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The Influences of Nb2O5, MnO2, CuO and B2O3 Addition on the Magnetic Properties of BaFe12O19 Magnets
Journal of Superconductivity and Novel Magnetism, 2012
In the present study, we have investigated the influence of different types of doping elements on magnetic properties of M-type BaFe 12 O 19 samples. It was observed that Nb 2 O 5 addition increases the coercive field, the remanence magnetization (M r), and saturation magnetization (M s) values by about 27 %, 47 %, and 53 %, respectively. In the same manner, MnO 2 also improves the magnetic parameters significantly. The M r and M s values show increments up to 40 % in magnitude. On the other hand, the best magnetic properties were achieved by the addition of CuO to the B 2 O 3 doped BaFe 12 O 19. These materials have M r and M s values up to ∼34 emu/g and ∼62 emu/g, respectively.
AIP Conference Proceedings, 2016
The objective of present work is to investigate the characteristic of BaFe 12 O 19 , B 2 O 3-BaFe 12 O 19 and Fe-BaFe 12 O 19 magnets fabricated at different milling time and sintering temperature. The characteristic of perrmanen magnet BaFe 12 O 19 with different content of B 2 O 3 and Fe which was fabricated at different milling time and sintering temperature were investigated. The powder mixtures were prepared by dry and wet milling at various milling time. The powder were mixtured and prepared by dry and wet milling at various milling time. The mixture powder was then compacted by anisotropic with compressive pressure of 50 N/cm 2. The green bodies were sinter at 1050, 1100, 1150 and 1200 o C and hold for 1 h, separately. The density, magnetic flux density and B-H curve were measured by Archimedes principle, Gauss meter and Permagraph, respectively. The microstructure and phase composition characterization were performed by SEM and XRD. The results of this study are presented in this paper. It shows that addition of Fe (in wet milling) and B 2 O 3 (in dry milling) respectively give a potential benefit to reduce the sintering temperature and improve the magnetic flux density of barium hexaferrite.
Journal of Physics: Conference Series, 2018
Research on the addition affixes Fe to a permanent magnet material of barium hexaferrite (BaFe12O19) has been done. Wet and dry milling were applied to the BaFe12O19 powder using high energy milling, where milling time are 0, 10, 20 and 40 hours. Variations the addition affixes Fe are 1, 5, 10 and 20% of weight with sintering temperature: 1100, 1150 and 1200 o C. Each temperature was hold for 1 hour. Average particle size, true density, porosity, bulk density and magnetic flux density of the sample of BaFe12O19 are observed parameters. The results showed that particle size decreased by 64.67% after 20 hours of milling from 21.4 m to 7.56 m. Before and after 20 hours of milling, true density also increase from 4.61 to 4.70 g/cm 3. The milling time is inversely to particle size and directly proportional to true density. The optimum condition of making a permanent magnet sample of BaFe12O19 was reached on the addition of 1% Fe and sintering temperature 1150 o C, generating porosity = 0.065%, bulk density = 4.89 g/cm 3 , and the magnetic flux density = 883.3 Gauss. Increasing of Fe and sintering temperature tends to increase the number of pores and magnification of particle size on the sample.
IOP Conference Series: Materials Science and Engineering, 2017
View the article online for updates and enhancements. You may also like Synthesis BaFe 12 O 19 based on natural iron sand with Cu and Ni doping using coprecipitation method B U P Elinda, Susilawati, Kosim et al.-Comparison of temperature dependent magnetic properties of uncoated and SiO 2 coated BaFe 12 O 19 nanoparticles K Nadeem, J Z Minhas, F Zeb et al.-Magnetic and microwave absorbing properties of BaFe 122x Co x Zn x O 19 (x = 0.0; 0.2; 0.4; 0.6) nanocrystalline E Handoko, S Iwan, Setia Budi et al.
INFLUENCE OF pH ON MAGNETIC PROPERTIES OF BaFe 12 O 19
Preparation and characterization of barium ferrite permanent magnets at different pH has been done. pH was varied at 4, 5, 6, and 7. The technology that used in this research was auto combustion sol gel method. Iron Nitrate (Fe(NO 3) 3), Barium Nitrate (Ba(NO 3) 2), Ammonium Hydroxide (NH 4 OH), Citric Acid (C 6 H 8 O 7 .H 2 O), and distilled water (H 2 O) were used as starting materials. The raw materials were mixed in solution and then stirred and heated at 80 o C constantly until it forms a gel. Dry powder was formed after evaporation at temperature 100 – 200 o C. The next process was calcinationat temperature of 900 o C with holding time for 180 minutes. Samples were compacted with a pressure of 100 kg/cm 2 in ring shape to obtain compact samples with outer diameter 8.5 mm, inner diameter 4 mm, and height 3 mm. After that, samples were sintered at temperature 1200 0 C with holding time for 60 minutes. The last step was magnetization process to obtain barium ferrite permanent magnets. Characterization was conducted on the dimensions and density of the sample , magnetic properties characterized by Permagraph Magnet Physik, compounds that formed and particle size by XRD, magnetic flux density by Gauss Meter Yokogawa. The best result in this research that has optimum magnet characteristic was in pH 7, which the density was 4.11 g/cm 3 and magnetic flux density was 800 Gauss. The optimum magnetic characteristics obtained were remanent induction (Br) of 2.21 kG, coercivity (HcJ) of 2.64 kOe, and maximum energy product (BHmax) of 1.04 MGOe.
METAL-OXIDES COMPOSITES FOR BaFe 12 O 19 PERMANENT MAGNETS
Le Journal de Physique Colloques, 1977
RhmB. -Des composBs metal-ferrite pour aimants permanents ont et6 obtenus par traitement chimique en solution aqueuse. Une attention particutibre a Ctk apportk ii la caractkrisation des couches minces de cobalt ainsi dtposks. Des effets intkressants ont Bt6 releves en Btudiant le comportement magnktique des poudres aprh dBp6t. On a mis ainsi en hidence la possibilitk d'obtenir des produits frittes prkentant un bon cornpromis entre les valeurs des differentes pro-pri6tQ magnbtiques et mecaniques.