Magnetic properties of Sr-La system M-type ferrite fine particles prepared by controlling the chemical coprecipitation method

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)

DOI:https://doi.org/10.1109/20.800497· OSTI ID:20000754

Yamamoto, Hiroshi; Seki, Hirota

Single phase Sr-La M-type ferrite fine particles were prepared by the chemical coprecipitation and subsequent heat-treatment methods. Optimum magnetic properties were achieved with materials of composition Sr{sub 0.794}{sup 2+}La{sub 0.172}{sup 3+}Fe{sub 0.335}{sup 2+}Fe{sub 11.74}{sup 3+}O{sub 19}, and heat-treatment of 950 C x 2h in air. The magnetic and physical properties are {sigma}{sub s} = 90.5 x 10{sup {minus}6} Wb {center{underscore}dot} m/kg (72.0emu/g), H{sub cJ} = 505.3 kA/m (6.35 kOe), Tc = 454.4 C, the lattice constants a = 0.5882nm, c = 2.303nm, the activation energy = 230.9kJ/mol(55.2kcal/mol), and the average particle size = 0.3{micro}m.

• Research Organization: Meiji Univ., Kawasaki (JP)
• OSTI ID: 20000754
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Vol. 35, Issue 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STRONTIUM OXIDES
LANTHANUM OXIDES
IRON OXIDES
FABRICATION
MAGNETIC PROPERTIES
CHEMICAL COMPOSITION