Anisotropic SmCo{sub 5} nanoflakes by surfactant-assisted high energy ball milling

Journal Article · Sat May 15 04:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3339775· OSTI ID:21476207

Cui, B Z; Gabay, A M; Li, W F; Hadjipanayis, G C ^[1]; Marinescu, M; Liu, J F ^[2]

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1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
2. Electron Energy Corporation, 924 Links Ave., Landisville, Pennsylvania 17538 (United States)

Crystallographically anisotropic SmCo{sub 5} nanoflakes were fabricated directly by one-step surfactant-assisted high energy ball milling (HEBM) of Sm{sub 17}Co{sub 83} ingot powders for 5 h in heptane and oleic acid (OA) without preprocessing or further annealing. The SmCo{sub 5} nanoflakes have a strong [001] out-of-plane texture. The thickness of nanoflakes is in the range of 8-80 nm while their length is 0.5-8 {mu}m. The surfactant OA plays an important role in the formation of SmCo{sub 5} nanoflakes. HEBM of SmCo{sub 5} ingots in heptane without OA resulted in the formation of magnetically isotropic more or less equiaxed SmCo{sub 5} particles with a size of 2-30 {mu}m. Closely packed 'kebablike' SmCo{sub 5} nanoflakes were formed by HEBM in heptane with 15 wt % OA. HEBM in 150 wt % OA led to well-separated nanoflakes instead of the closely packed kebablike nanostructure. This resulted in the enhanced [001] out-of-plane texture. In-plane transmission electron microscope examination showed that the SmCo{sub 5} nanoflakes were composed of grains with sizes in the range of 4-8 nm. Coercivities of about 18.0 kOe were obtained for the anisotropic SmCo{sub 5} nanoflakes.

• OSTI ID: 21476207
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 107; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKANES
ALLOYS
ANISOTROPY
ANNEALING
CARBOXYLIC ACIDS
COBALT ALLOYS
COERCIVE FORCE
CRYSTALS
ELECTRON MICROSCOPY
GRAIN SIZE
HEAT TREATMENTS
HEPTANE
HYDROCARBONS
MACHINING
MICROSCOPY
MICROSTRUCTURE
MILLING
MONOCARBOXYLIC ACIDS
NANOSTRUCTURES
OLEIC ACID
ORGANIC ACIDS
ORGANIC COMPOUNDS
PARTICLE SIZE
PARTICLES
POWDERS
RARE EARTH ALLOYS
SAMARIUM ALLOYS
SIZE
TEXTURE
TRANSITION ELEMENT ALLOYS
TRANSMISSION ELECTRON MICROSCOPY