Abstract
We have established the preparation process of hexagonal U-type ferrites Ba4Me2Fe36O60 (Me=Co, Ni, Mg) and investigated their crystal structure and magnetic properties. The U-type ferrite single phase was not fabricated by using a conventional ceramic synthesis process which comprises two-steps: calcination and sintering. We have found that the U-type ferrites single phase can be obtained by a one-step sintering method that skips the calcination process. The single phase of the U-type ferrite was formed at a very narrow temperature at about 1250°C. The values of saturation magnetization and the Curie temperature of Co2U ferrite were higher than those of Co2Z ferrite. Initial permeability of Co2U ferrite has a higher value than those of Ni2U and Mg2U ferrites. The U-type ferrite has a great potential for high frequency magnetic materials.
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