Study the Microwave absorption characteristics of U-type barium hexaferrites prepared using chemical method

Abstract

U-type Barium hexaferrite with stoichiometric composition

Ba ₄ Co _0.3 Zn _0.6 Cu _1.1 Fe ₃₆ O ₆₀ has been prepared using citrate precursor method at

low temperatures (1000, 1050, and 1100°C). The XRD patterns of the prepared

powders at temperatures (1000 and 1050°C) show the presence of spinel, M and

Y-type phases, while U-type ferrite phase(with crystallite size 40 – 90 nm)

obtained at 1100 °C. Radar absorbing nanocomposite samples were prepared by

mixing, molding and curing mixtures of Ba ₄ Co _0.3 Zn _0.6 Cu _1.1 Fe ₃₆ O ₆₀ powders

(prepared at 1100°C) with epoxy resin (ER),(80:20% weights).The microwave

attenuation measurements were based on the Transmission/Reflection method

using rectangular waveguides as the confining medium for the samples at 8.0 – 12

GHz frequencies.