Preparation of Ba-Ferrite Particles Using the SuperCritical Water Crystallization Method

Sung-Chan Nam; Sang-Do Park; Geon-Joong Kim

Journal of Industrial and Engineering Chemistry, Vol.7, No.1, 38-43, January, 2001

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Preparation of Ba-Ferrite Particles Using the SuperCritical Water Crystallization Method

Sung-Chan Nam^†, Sang-Do Park , and Geon-Joong Kim¹

Korea Institue of Energy Research, Taejon 305-600, Korea
¹Department of Chemical Engineering, Inha University, Inchon 402-751, Korea

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Barium ferrite particles were synthesized from Ba(NO3)2, Fe(NO3)3 and KOH mixed solutions using hydrothermal crystallization in supercritical water. The experimental apparatus for production of barium ferrite is a flow-type apparatus. Fine barium ferrite particles were produced because supercritical water causes the metal hydroxides to be rapidly dehydrated before significant growth takes place. The effects of Fe/Ba ratio and reaction time on the formation, particle size, and magnetic properties of barium ferrite were studied. When the Fe/Ba molar ratio was varied from 0.5 to 12, single-phase barium ferrite powder was only produced at Fe/Ba molar ratios of 0.5 and 2. Also, with increasing residence time from 60 to 100 s, the BaO · 6Fe2O3 particle size grew smaller. Especially, uniform barium ferrite particles of size 100-200 nm were obtained at 100 s. In this study, therefore, single-phase barium ferrite particles can be produced continuously in a reaction time of less than 3 min.

Keywords:Barium Ferrite;Supercritical Water;Flow-Type

[References]

Smit J, Ferrites, 177 (1959)
Kojima H, Ferromagnetic Materials, 3, 189 (1982)
Ram SH, J. Magn. Magn. Mater., 82, 129 (1989)
Kaike Y, Kubo O, Ceram. Jpn., 18, 839 (1983)
Gerard P, Lacroix E, Marest G, Blanchard B, Roll G, Bechevet B, Solid State Commun., 71, 57 (1989)
Yamamori K, Tanaka T, Jitosho T, IEEE Tran. Magn., 27, 4960 (1991)
Watanabe K, J. Cryst. Growth, 169, 509 (1996)
Haneda K, Miyakawa C, Kojima H, J. Am. Ceram. Soc., 57, 354 (1974)
Barb D, Diamandescu L, Rusi A, Tarabasani-Mihaila D, Morariu M, Teodorescu V, J. Mater. Sci., 21, 1118 (1986)
Laville H, Bernier JC, J. Mater. Sci., 15, 73 (1980)
Tumazawa H, Maeda Y, Sada E, J. Mater. Sci. Lett., 14(1), 68 (1995)
Hakuta Y, Adschiri T, Suzuki T, Chida T, Seino K, Arai K, J. Am. Ceram. Soc., 81, 2461 (1998)
Arai K, Ajiri T, U.S. Patent, 5,433,878 (1995)
Nam SC, Lee JH, Kim JG, Kim KJ, Park SD, Theories and Applications of Chemical Engineering, Proceeding of KIChE Meetings, 5, 4149 (1999)
Kumar S, Messung GL, White WB, J. Am. Ceram. Soc., 76, 617 (1993)
Sada E, Kumazawa H, Cho HM, Ind. Eng. Chem. Res., 30, 1319 (1991)
Ataie A, Piramoon MR, Harries IR, Ponton CJ, Mag. Mag. Mater., 30, 5600 (1995)
Wang ML, Shih ZW, Lin CH, J. Cryst. Growth, 139, 47 (1994)

[Referenced By]

[Related Articles]

[1] Smit J, Ferrites, 177 (1959)

[2] Kojima H, Ferromagnetic Materials, 3, 189 (1982)

[3] Ram SH, J. Magn. Magn. Mater., 82, 129 (1989)

[4] Kaike Y, Kubo O, Ceram. Jpn., 18, 839 (1983)

[5] Gerard P, Lacroix E, Marest G, Blanchard B, Roll G, Bechevet B, Solid State Commun., 71, 57 (1989)

[6] Yamamori K, Tanaka T, Jitosho T, IEEE Tran. Magn., 27, 4960 (1991)

[7] Watanabe K, J. Cryst. Growth, 169, 509 (1996)

[8] Haneda K, Miyakawa C, Kojima H, J. Am. Ceram. Soc., 57, 354 (1974)

[9] Barb D, Diamandescu L, Rusi A, Tarabasani-Mihaila D, Morariu M, Teodorescu V, J. Mater. Sci., 21, 1118 (1986)

[10] Laville H, Bernier JC, J. Mater. Sci., 15, 73 (1980)

[11] Tumazawa H, Maeda Y, Sada E, J. Mater. Sci. Lett., 14(1), 68 (1995)

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

[13] Arai K, Ajiri T, U.S. Patent, 5,433,878 (1995)

[14] Nam SC, Lee JH, Kim JG, Kim KJ, Park SD, Theories and Applications of Chemical Engineering, Proceeding of KIChE Meetings, 5, 4149 (1999)

[15] Kumar S, Messung GL, White WB, J. Am. Ceram. Soc., 76, 617 (1993)

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

[17] Ataie A, Piramoon MR, Harries IR, Ponton CJ, Mag. Mag. Mater., 30, 5600 (1995)

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