Influence of Stoichiometry and Alkalinity on Barium Hexaferrite Formation via the Supercritical Water Crystallization Method

Seungwook Rho; Sangdo Park

Korean Journal of Chemical Engineering, Vol.19, No.1, 120-125, January, 2002

Seungwook Rho, and Sangdo Park^†

Energy and Environment Research Department, Korea Institute of Energy Research, P.O. Box 103, Yoosung, Daejeon 305-600, Korea

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Fine particles of barium hexaferrite were prepared from aqueous solutions of iron nitrate, barium nitrate and potassium hydroxide by utilizing a continuous flow type supercritical water crystallization method. The influence of stoichiometry (Fe/Ba mole ratio) and alkalinity (R) on the product composition and morphology was studied under fixed temperature, pressure and residence time. Experiments were performed with varying Fe/Ba mole ratios and alkali mole ratio (R). Within mole ratio ranges of 0.5

Keywords:Barium Hexaferrite;Supercritical Water Crystallization

[References]

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[Referenced By]

[Related Articles]

[1] Adschiri T, Kanazawa K, Arai K, J. Am. Ceram. Soc., 75, 1019 (1992)

[2] Ataie A, Piramoon MR, Harris IR, Ponton CB, J. Mater. Sci., 30(22), 5600 (1995)

[3] Chou F, Feng X, Li J, Liu Y, J. Appl. Phys., 61(8), 3881 (1987)

[4] Fujiwara T, IEEE Trans. Magn., 21(5), 1480 (1985)

[5] Hakuta Y, Adschiri T, Suzuki T, Chida T, Seino K, Arai K, J. Am. Ceram. Soc., 81(9), 2461 (1998)

[6] Kiyama M, Bull. Chem. Soc. Jpn., 49(7), 1855 (1976)

[7] Kubo O, Ido T, Yokoyama H, IEEE Trans. Magn., 18(5), 1122 (1982)

[8] Nam SC, Lee JH, Kim JG, Kim KJ, Park SD, Theor. Appl. Chem. Eng., 5(2), 4149 (1999)

[9] Sada E, Kumazawa H, Cho HM, Ind. Eng. Chem. Res., 30(6), 1319 (1991)

[10] Sakai H, Hanawa K, Aoyagi K, IEEE Trans. Magn., 28(6), 3355 (1992)

[11] Wang ML, Shih ZW, Lin CH, J. Cryst. Growth, 139, 47 (1994)