EFFECT OF FE3+/BA2+ MOLE RATIO AND SINTERING TEMPERATURES ON THE MICROSTRUCTURE AND MAGNETIC PROPERTIES OF NANO PARTICLE BARIUM HEXAFERRITE (BAM) PRODUCED BY SOL GEL AUTO COMBUSTION
ABSTRACT: Nanocrystalline of
Barium Hexaferrite (BaFe12O19) powders have been synthesized by using the sol
gel auto combustion method. The ferrite precursors were obtained from aueous
mixtures of Barium nitrate and Ferric nitrate by auto combustion reaction from
gel point. These precursors were sintered at different temperatures ranging
from 700 to 1000° C for constant calcinations time 2,5 h in a static air
atmosphere. Effects of Fe3+/Ba2+ mol ratios and sintering temperatures on the microstructure
and magnetic properties were systematically studied. The powders formed were
investigated using X-ray diffraction (XRD), scanning electron microscope (SEM)
and VSM. The results obtained that the phase BaFe12O19 powders were achieved by
the Fe3+/Ba2+ mole ratio from the stoichiometric value 11, 11.5 and 12 at
temperature 950° C. With increasing of temperature sintering, coercivity and
magnetization value tends to rising. The maximum saturation magnetization
(66.16 emu/g) was achieved at the Fe3+/Ba2+ mole ratio to 11.5 and the
sintering temperature 950° C. The maximum coercivity value 3542 Oe achieved at
mole ratio sample 12 with sintering temperature 950° C. Maximum saturation 6616
emu/g achieved at mole ratio sample 115 with the same temperature.
Author: WIDYASTUTI, FELLY
YULIAN FF, ROCHMAN R, AND HARIYATI PURWANINGSIH
Journal Code: jptindustrigg110003
Artikel Terkait :
Jp Teknik Industri gg 2011
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