Anantharaman, M R; Soloman, M A; Joy, P A; Philip, Kurian(CSIR, July 5, 2005)
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Abstract:
Fine particles of barium ferrite (BaFe12O19) belonging to the M-type hexagonal ferrites were prepared by the
conventional ceramic techniques. They were incorporated into a nitrile rubber matrix according to a specific recipe for
various loadings to produce rubber ferrite composites (RFC). The percolation threshold is not reached for a maximum
loading of 130 phr (parts per hundred rubber). Here in this paper, the magnetic properties and processability of the nitrile
rubber based RFCs containing barium ferrite (BaF) and HAF carbon black is reported. The magnetic properties of the
ceramic ferrite and these rubber ferrite composites were evaluated and it was found that the coercivity values of RFCs were
less than that of the ceramic BaF, but remained constant with the loading of both the ferrite filler and carbon black.
However, other properties like saturation magnetization and magnetic remanence increased with the loading of ferrite filler.
Description:
Indian Journal of Chemical Technology
Vol. 12, September 2005, pp. 582-587
Anantharaman, M R; Jagatheesan, S; Malini, K A; Sindhu, S; Narayanasamy, A; Chinnasamy, C N; Jacobs, J B; Reijne, S; Seshan, K; Smits, R H H; Brongersma, H H(Elsevier, April 14, 1998)
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Abstract:
Zinc ferrite belongs to the class of normal spinels where it is assumed to have a cation distribution of
Zn2`(Fe3`)2(O2~)4, and it is purported to be showing zero net magnetisation. However, there have been recent reports
suggesting that zinc ferrite exhibits anomaly in its magnetisation. Zinc ferrite samples have been prepared by two
di¤erent routes and have been analysed using low energy ion scattering, Mo¬ ssbauer spectroscopy and magnetic
measurements. The results indicate that zinc occupies octahedral sites, contrary to the earlier belief that zinc occupies
only the tetrahedral sites in a normal spinel. The amount of zinc on the B site increases with decrease in particle size. The
LEIS results together with the Mo¬ ssbauer results and the magnetic measurements lead to the conclusion that zinc
occupies the B site and the magnetisation exhibited by ultraÞne particles of zinc is due to short range ordering
Description:
Journal of Magnetism and Magnetic Materials 189 (1998) 83-88