Tailoring of structural, electrical and magnetic properties of BaCo2 W-type hexaferrites by doping with Zr-Mn binary mixtures for useful applications

Single-phase W-type hexaferrite, BaCo2Fe16-2x(ZrMn)(x)O-27 (x=0.0-1.0), has been synthesized by the chemical co-precipitation technique. Mossbauer analysis indicates substitution of Zr ions on tetrahedral (4e and 4f(IV)) sites and Mn ions on the octahedral '4f(VI) site' at low-doped concentration when the concentration is increased Mn ions but show preference for the octahedral '2b site'. The highest enhancement in the value of the room temperature resistivity of 2.82 x 10(9) Omega cm has been obtained by doping with Zr-Mn content of x=0.6. The dissipation factor increases from 6.49 x 10(3) to 9.97 x 10(3) at 10 kHz with the addition of Zr-Mn dopants. Such materials are potentially suitable for electromagnetic attenuation purposes, for microwave absorption and as radar absorbing material. High values of saturation magnetization (67 emu/g) and remanent magnetization (34.7 emu/g) are obtained for substitution level of x=0.4 making them suitable for data processing devices. (C) 2011 Elsevier B.V. All rights reserved.