Examinando por Materia "Permanent magnets"
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- PublicaciónSólo datosEffect of Nitrogenation on the Intrinsic Magnetic Properties of the Compounds (Nd1-xCeₓ)1.1Fe₁₀CoTi(IEEE Transactions on Magnetics, 2020-08-28) Martínez Sánchez, H.; Zamora Alfonso, L. E.; Trujillo Hernandez, J. S.; Salazar Jaramillo, D.; Pérez Alcázar, G. A.The effect of the nitrogenation process on intrinsic magnetic properties such as saturation magnetization, anisotropy field, magnetocrystalline anisotropy constant, and Curie temperature of the (Nd 1−x Ce x ) 1.1 Fe 10 CoTi ( x=0.0 , 0.5 and 1) alloy systems are analyzed. The anisotropy field increases from 1.8 to 2.8 T with the substitution of Nd by Ce. The nitrogenation process resulted in an increase in the saturation magnetization, anisotropy field, and Curie temperature. The best magnetic properties were found for the Nd 1.1 Fe 10 CoTiN y compound, for which it was estimated a saturation magnetization of 153.3 Am 2 kg −1 , anisotropy field of 10.3 T, anisotropy constant of 5.98 MJm −3 , and Curie temperature of 768.9 K. A slight reduction in mean particle size was obtained after the nitrogenation process (~5.4 to ∼3.9 μm ).
- PublicaciónSólo datosMechanochemical Synthesis and Nitrogenation of the Nd1.1Fe10CoTi Alloy for Permanent Magnet(Molecules, 2021-06-26) Martínez Sánchez, Hugo; Hadjipanayis, George; Pérez Alcázar, Germán Antonio; Zamora Alfonso, Ligia Edith; Trujillo Hernández, Juan SebastiánIn this work, the mechanochemical synthesis method was used for the first time to produce powders of the nanocrystalline Nd1.1Fe10CoTi compound from Nd2O3, Fe2O3, Co and TiO2. High-energy-milled powders were heat treated at 1000 °C for 10 min to obtain the ThMn12-type structure. Volume fraction of the 1:12 phase was found to be as high as 95.7% with 4.3% of a bcc phase also present. The nitrogenation process of the sample was carried out at 350 °C during 3, 6, 9 and 12 h using a static pressure of 80 kPa of N2. The magnetic properties Mr, µ0Hc, and (BH)max were enhanced after nitrogenation, despite finding some residual nitrogen-free 1:12 phase. The magnetic values of a nitrogenated sample after 3 h were Mr = 75 Am2 kg–1, µ0Hc = 0.500 T and (BH)max = 58 kJ·m–3. Samples were aligned under an applied field of 2 T after washing and were measured in a direction parallel to the applied field. The best value of (BH)max ~ 114 kJ·m–3 was obtained for 3 h and the highest µ0Hc = 0.518 T for 6 h nitrogenation. SEM characterization revealed that the particles have a mean particle size around 360 nm and a rounded shape.
- PublicaciónSólo datosMechanochemical Synthesis and Nitrogenation of the Nd1.1Fe10CoTi Alloy for Permanent Magnet(Molecules, 2021-06-24) Martínez Sánchez, Hugo; Hadjipanayis, George; Pérez Alcázar, Germán Antonio; Zamora Alfonso, Ligia Edith; Trujillo Hernández, Juan SebastiánIn this work, the mechanochemical synthesis method was used for the first time to produce powders of the nanocrystalline Nd1.1Fe10CoTi compound from Nd2O3, Fe2O3, Co and TiO2. High-energy-milled powders were heat treated at 1000 °C for 10 min to obtain the ThMn12-type structure. Volume fraction of the 1:12 phase was found to be as high as 95.7% with 4.3% of a bcc phase also present. The nitrogenation process of the sample was carried out at 350 °C during 3, 6, 9 and 12 h using a static pressure of 80 kPa of N2. The magnetic properties Mr, µ0Hc, and (BH)max were enhanced after nitrogenation, despite finding some residual nitrogen-free 1:12 phase. The magnetic values of a nitrogenated sample after 3 h were Mr = 75 Am2 kg–1, µ0Hc = 0.500 T and (BH)max = 58 kJ·m–3. Samples were aligned under an applied field of 2 T after washing and were measured in a direction parallel to the applied field. The best value of (BH)max ~ 114 kJ·m–3 was obtained for 3 h and the highest µ0Hc = 0.518 T for 6 h nitrogenation. SEM characterization revealed that the particles have a mean particle size around 360 nm and a rounded shape.