Preparation of Co2Z-Ferrite Fine Powder by Gel-Combustion

概要

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Gel-combustion synthesis was used to synthesize a fine powder of Co2Z-ferrite (Ba3Co2Fe24O41). Either citric acid or glycine was added, as a peptizer, to the mixed aqueous solution of Ba(NO3)2, Co(NO3)2•6H2O and Fe(acac)3. The product gel was ignited at 150°C and then fired again in a temperature range of between 500°C and 1200°C. The ignited product was a mixture of CoFe2O4 and Ba(NO3)2 when citric acid was used as a gelling agent. Its fired product was a mixture of Co2Z-, CoY-, BaM-ferrites and BaFe2O4. A higher temperature was attained during the ignition of the glycine gel rather than the citric acid gel. The ignited product of the glycine gel was a mixture of CoFe2O4 and BaFe2O4. Pure Co2Z-ferrite fine powder was subsequently obtained by firing this ignited product at 1000°C. This temperature is much lower than the firing temperature of 1300°C required by the solid state reaction. Its crystallite and average particle sizes were 42∼48 nm and 180∼200 nm, respectively. Saturation magnetization was 45∼47 emu/g and coercivity was 0.59∼0.90 kOe.
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