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On the Magnetic and Structural Properties of Neodymium Iron Boron Nanoparticles

Research paper by Hamed Rahimi, Ali Ghasemi; Reza Mozaffarinia; Majid Tavoosi

Indexed on: 11 Aug '16Published on: 01 Aug '16Published in: Journal of Superconductivity and Novel Magnetism



Abstract

Abstract Neodymium iron boron nanoparticles were synthesized by means of sol–gel method. Correlation between magnetic properties and structural features were evaluated. The Nd–Fe–B gel was formed in hydrogen atmosphere. The gel was subsequently annealed under vacuum condition to obtain Nd–Fe–B oxide phases. The oxides powders were reduced at different temperatures of 750, 775, 800, 825, 850, and 875 ∘C for 3 h in a mixture of Ar and H2 atmosphere to prepare Nd2Fe14B nanoparticles. The role of reduction temperature on phase, morphologies, microstructure, and magnetic properties of the final powders was investigated by employing X-ray diffraction (XRD), field emission-scanning electron microscope (FE-SEM), and vibrating sample magnetometer (VSM), respectively. The results show that Nd2Fe14B phase was formed successfully at temperatures of 750–875 ∘C. Maximum coercivity of 1757 Oe was obtained at 875 ∘C. The variation of coercivity was described by considering the particle size and magnetocrystalline anisotropy constant.AbstractNeodymium iron boron nanoparticles were synthesized by means of sol–gel method. Correlation between magnetic properties and structural features were evaluated. The Nd–Fe–B gel was formed in hydrogen atmosphere. The gel was subsequently annealed under vacuum condition to obtain Nd–Fe–B oxide phases. The oxides powders were reduced at different temperatures of 750, 775, 800, 825, 850, and 875 ∘C for 3 h in a mixture of Ar and H2 atmosphere to prepare Nd2Fe14B nanoparticles. The role of reduction temperature on phase, morphologies, microstructure, and magnetic properties of the final powders was investigated by employing X-ray diffraction (XRD), field emission-scanning electron microscope (FE-SEM), and vibrating sample magnetometer (VSM), respectively. The results show that Nd2Fe14B phase was formed successfully at temperatures of 750–875 ∘C. Maximum coercivity of 1757 Oe was obtained at 875 ∘C. The variation of coercivity was described by considering the particle size and magnetocrystalline anisotropy constant.∘2214214∘∘