Annealing Effect on Microstructure and Coercivity of YCo5 Nanoparticles Obtained by Mechanical Milling

José Trinidad Elizalde Galindo; Reiko Sato Turtelli; Roland Grössinger; José Andrés Matutes-Aquino

doi:10.4028/www.scientific.net/AMR.68.122

Paper Titles

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Friction Stir Linear Welding of an Aluminum Alloy
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Annealing Effect on Microstructure and Coercivity of YCo₅ Nanoparticles Obtained by Mechanical Milling
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Magnetic and Electronic Properties of the Compound Y(Co,Fe)₅ Calculated by the Augmented Spherical Wave Method
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Comparative Study of Corrosion in Physiological Serum of Ceramic Coatings Applied on 316L Stainless Steel Substrate
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 68Annealing Effect on Microstructure and Coercivity...

Annealing Effect on Microstructure and Coercivity of YCo₅ Nanoparticles Obtained by Mechanical Milling

Abstract:

Nanocrystalline YCo5 powders with high coercivity were prepared by mechanical milling and subsequent heat treatment at 820 °C for different annealing times, ta = 2.5, 3.0, 3.5 and 4.5 min, obtaining average crystallite sizes of  17, 19, 32 and 39 nm., respectively. The coercivity values were determined from the hysteresis loops measured at maxima fields of Hm = 5 and 20 T. The highest coercivity was obtained for the sample exhibiting  19 nm, where at room temperature and Hm = 5 T, the coercivity value is of 9.0 kOe. At 77 K and Hm = 5 T, the coercivity increase to 11.8 kOe and for Hm = 20 T, a higher value such as 13.1 kOe was found. The Ms/Mr ratio is enhanced to 0.62 indicating the occurrence of exchange interaction among nanocrystalline magnets.