Effect of Nd3+ Substitution on the Phase Evolution and Magnetic Properties of W-Type Strontium Hexaferrite
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Nd substituted W-type strontium hexaferrite powders with composition of Sr0.9Nd0.1ZnCoFe16O27 were prepared by ceramic conventional method at various calcination temperatures and times. With the Nd substitution, the singlephase hexagonal structure has been formed at higher temperatures and longer times while the effect of calcination temperature on the phase evolution was more pronounced. The saturation magnetization of SrZnCoFe16O27 increased from 72.8 to 75.0 emu/g and the coercivity decreased from 430 to 360 Oe by Nd substitution. The microwave absorption properties of hexaferrite-polymer bulk composites in epoxy resin matrix were measured in X-band frequency range (8–12 GHz). These measurements exhibited the maximum absorption of −21 dB at 9.6 GHz with an absorption bandwidth of more than 2.1 GHz for Sr0.9Nd0.1ZnCoFe16O27 with 4.5 mm thickness.
KeywordsW-type strontium hexaferrite Nd substitution Magnetic properties Microwave absorption
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