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Abstract
SmCo5 is one of the most promising candidates for achieving a hard magnet with a high coercivity. Usually, composition, morphology, and size determine the coercivity of a magnet, however, it is challenging to synthesize phase pure SmCo5 with optimal size and high coercivity. In this paper, we report on the successful synthesis of phase pure SmCo5 with spherical/prolate spheroids shape. Size control is obtained by utilizing colloidal SiO2 as a template preventing aggregation and growth of the precursor. The amount of SiO2 nanoparticles (NPs) in the precursor tunes the average particle size (APS) of the synthesized SmCo5 with particle dimension from 740 to 504 nm. As-prepared pure SmCo5 fine powder obtained from using 2 ml SiO2 suspension possesses an APS of 625 nm and exhibits an excellent coercivity of 2986 kA m−1 (37.5 kOe) without alignment of the particles prior to magnetisation measurements. Comparing with a reference sample prepared without adding any SiO2 NPs, an enhancement of 35% of the coercivity was achieved. The improvement is due to phase purity, stable single-domain (SSD) size, and shape anisotropy originating from the prolate spheroid particles.
Highlights
SmCo5 is one of the most promising candidates for achieving a hard magnet with a high coercivity
The prepared compounds were investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) combined with Energy Dispersive
The S iO2 NPs with spherical shape have an average diameter of 25.1(3) nm (Fig. S1, supporting information)
Summary
SmCo5 is one of the most promising candidates for achieving a hard magnet with a high coercivity. As-prepared pure SmCo5 fine powder obtained from using 2 ml SiO2 suspension possesses an APS of 625 nm and exhibits an excellent coercivity of 2986 kA m−1 (37.5 kOe) without alignment of the particles prior to magnetisation measurements. The traditional way of producing micro-sized SmCo5 powder is by mechanical ball milling of arc melted ingots This usually introduces unwanted effects such as defects, irregular shapes, contaminants, etc., resulting in low magnetic p erformance[4,5,6]. Dong et al synthesized dispersed particles of S mCo5 by forming an insolation shell of CaO around them for preventing the aggregation at high temperature18Ma et al reported the chemical synthesis of anisotropically shaped SmCo5 particles and revealed the morphological evolution mechanism[8]. The SmCo5 particles with an APS of 625 nm exhibit the highest coercivity in this study with a value of 2986 kA m−1 (37.5 kOe), which exceeds most coercivities reported for S mCo521
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