The improved oxidation resistance of Si-doped SmCo{sub 7} nanocrystalline magnet

Journal Article · Mon Jun 20 00:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3602321· OSTI ID:21518495

Lili, Liu; Chengbao, Jiang ^[1]

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1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)

A drastic improvement in oxidation resistance of SmCo{sub 7} nanocrystalline magnet was achieved by alloying silicon at 500 deg. C. The maximum energy product (BH){sub max} loss of SmCo{sub 6.1}Si{sub 0.9} nanocrystalline magnet was about 5.6% after oxidation at 500 deg. C for 500 h, which was significantly less than 52.1% of SmCo{sub 7} nanocrystalline magnet. A general mode was proposed to predict the (BH){sub max} loss as a function of oxidation time at 500 deg. C. The formation of SiO{sub 2} oxide in the internal oxidation layer plays an important role in reducing the oxidation rate and oxygen diffusion coefficient, which leads to the enhancement of inherent oxidation resistance of SmCo{sub 6.1}Si{sub 0.9} nanocrystalline magnet.

• OSTI ID: 21518495
• Journal Information: Applied Physics Letters, Vol. 98, Issue 25; Other Information: DOI: 10.1063/1.3602321; (c) 2011 American Institute of Physics; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
COBALT ALLOYS
CRYSTALS
DIFFUSION
DOPED MATERIALS
LAYERS
MAGNETS
NANOSTRUCTURES
OXIDATION
OXYGEN
SAMARIUM ALLOYS
SILICON
SILICON ALLOYS
SILICON OXIDES
SURFACES
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
EQUIPMENT
MATERIALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH ALLOYS
SEMIMETALS
SILICON COMPOUNDS
TRANSITION ELEMENT ALLOYS