Mechanochemical Synthesis and Nitrogenation of the Nd1.1Fe10CoTi Alloy for Permanent Magnet
| Autor: | George C. Hadjipanayis, Juan Sebastián Trujillo Hernández, H. Sánchez, Ligia Edith Zamora Alfonso, Germán Antonio Pérez Alcázar |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy Analytical chemistry nitrogenation Pharmaceutical Science 02 engineering and technology engineering.material 01 natural sciences Article Analytical Chemistry QD241-441 Phase (matter) 0103 physical sciences Drug Discovery Physical and Theoretical Chemistry extrinsic magnetic properties 010302 applied physics spin reorientation X-ray diffraction patterns Organic Chemistry permanent magnets mechanochemical synthesis 021001 nanoscience & nanotechnology Nanocrystalline material Chemistry (miscellaneous) Magnet Volume fraction engineering Heat treated Molecular Medicine Particle size 0210 nano-technology |
| Zdroj: | Molecules Volume 26 Issue 13 Molecules, Vol 26, Iss 3854, p 3854 (2021) |
| ISSN: | 1420-3049 |
| DOI: | 10.3390/molecules26133854 |
| Popis: | In 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |