Iron source effect on BaFe_<12>O_<19> preparation through citrate route

概要

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Both magnetization and coercivity should be controlled on BaFe_<12>O_<19> for its usage in magnetic recording. Preparation of BaFe_<12>O_<19> was studied in citrate route by changing the kinds of iron source. Stoichiometric mixtures of iron compounds with Ba(NO_3)_2 were dissolved in distilled water. They were mixed with citric acid aqueous solution and then condensed on a hot plate to their gelatinous products. Their prefired products below 450℃ were pelletized and then fired in a temperature range between 750 and 900℃. The product from iron nitrate was a mixture of α-Fe_2O_3, BaFe_2O_4 and a small amount of BaFe_<12>O_<19>. The product from Fe(acac)_3 was pure BaFe_<12>O_<19> fine powder with a crystallite size of <90nm. The fine powdered product at 850℃ had a saturation magnetization of 58.5emu・g^<-1> and a coercivity of 5.5kOe.
2009-01-01