Title :
Magnetic properties of aerosol synthesized barium ferrite particles
Author :
Tang, Z.X. ; Nafis, S. ; Sorensen, C.M. ; Hadjipanayis, G.C. ; Klabunde, K.J.
Author_Institution :
Dept. of Phys., Kansas State Univ., Manhattan, KS, USA
fDate :
9/1/1989 12:00:00 AM
Abstract :
Barium ferrite fine particles have been synthesized from ferric nitrate and barium nitrate aqueous solution by an aerosol technique. The as-received particles showed a spin-glass behavior with a history-dependent low-field magnetization below 180 K. An exothermic peak with an initial crystallization temperature of 687°C was found by DSC (differential scanning calorimetry) analysis. Heat treatments above this temperature greatly changed the magnetic properties and morphologies without changing the Ba/Fe atomic ratio, which was 1/12. Heat-treated samples had coercivities and saturation magnetizations as high as 5360 Oe and 70.6 emu/g, respectively
Keywords :
ferrimagnetic properties of substances; ferrites; magnetic properties of fine particles; powder technology; 180 K; 687 C; DSC; aerosol technique; as-received particles; coercivities; differential scanning calorimetry; exothermic peak; heat treatment; history-dependent low-field magnetization; initial crystallization temperature; magnetic properties; morphologies; saturation magnetizations; spin-glass behavior; Aerosols; Barium; Calorimetry; Crystallization; Ferrites; Heat treatment; Magnetic analysis; Magnetic properties; Magnetization; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
