Encapsulated nanoparticles of iron metal

Journal Article · Sat Apr 01 04:00:00 EST 1995 · High Temperature and Materials Science

OSTI ID:191333

Klabunde, K J; Zhang, D; Glavee, G N; Sorensen, C M ^[1]; Hadjipanayis, G C ^[2]

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1. Kansas State Univ., Manhattan, KS (United States)
2. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

Metastable iron-magnesium particles as intimate mixtures were prepared by co-depositing Fe and Mg vapors with a hydrocarbon diluent at 77 K, followed by warming to room temperature. Upon heat treatment phase segregation was accomplished with reasonable control. Core-shell particles (Fe as core) were formed, where Fe particles were encapsulated and with appropriate heat treatment could be completely protected from surface oxidation. Crystallite sizes of the Fe core ranged from 3--26 nm depending on the heat treatment procedure. The magnetic properties of these encapsulated particles indicated extremely soft ferromagnetism with very low coercivities and with little size dependency. These results coupled with earlier findings suggest that coercivity can be controlled (dominated) by surface coating in such small particles.

• OSTI ID: 191333
• Report Number(s): CONF-9404290--
• Journal Information: High Temperature and Materials Science, Journal Name: High Temperature and Materials Science Journal Issue: 2-3 Vol. 33; ISSN 1080-1278; ISSN HTMSFP
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMBIENT TEMPERATURE
COERCIVE FORCE
COMPOSITE MATERIALS
CORROSION PROTECTION
ENCAPSULATION
FABRICATION
GRAIN SIZE
HEAT TREATMENTS
IRON
MAGNESIUM
MAGNETIC PROPERTIES