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Polycrystalline samples of Sr3Co2Fe24O41 and Ba3Co2Fe24O41 have been prepared by a sol-gel method. The XRD data indicate that the samples are Co2Z-type hexaferrites with the centrosymmetric space group of P63/mmc. The SEM micrographs suggest that mixture plate-like grains are formed and Sr3Co2Fe24O41 shows more dense grain structure. High-temperature dielectric relaxation behaviors are studied in...
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