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- Title
EFFECT OF Mg<sup>2+</sup> SUBSTITUTIONS ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF Co-Mg W-TYPE HEXAGONAL FERRITE.
- Authors
AKHTAR, M. N.; ISLAM, M. U.; NIAZI, SHAHIDA B.; RANA, M. U.
- Abstract
W-type hexagonal ferrites having the formula BaCo2-xMgxFe16O27 with x = 0, 0.4, 0.8, 1.2, 1.6, 2.0 were synthesized by the chemical coprecipitation method. XRD analysis shows that the structure of all the compositions is W-type hexagonal ferrite. The c/a ratio varies from 5.48 to 5.52, consistent with the standard values. It was observed that the bulk density and X-ray density decrease whereas porosity increases with increasing concentration of Mg2+. Room temperature resistivity increases, from 103 to 107 (Ω cm) by increasing the concentration of Mg2+, due to an increased number of grain boundaries. The remanence and saturation magnetization decrease with increasing Mg2+ content while coercivity increases as the Mg2+ increases according to the relation Hc ∝ 1/r. The measured coercivity values are suitable for use in high frequency applications such as microwave absorber materials.
- Subjects
MAGNESIUM; FERRITES; MAGNETIC properties; PRECIPITATION (Chemistry); INORGANIC synthesis; X-rays; CRYSTAL grain boundaries; POROSITY
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2011, Vol 25, Issue 8, p1149
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979211058328