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Issue
Korean Journal of Chemical Engineering,
Vol.21, No.3, 582-588, 2004
Characterization of Barium Hexaferrite Produced by Varying the Reaction Parameters at the Mixing-Points in a Supercritical Water Crystallization Process
Nam SC, Kim GJ
Barium hexaferrite (BaFe12O19) was synthesized from a Ba(NO3)2, Fe(NO3)3 and KOH mixed solution by hydrothermal treatment of the solution using a supercritical water flow apparatus. The first step is the hydrolysis of the nitrates of barium and iron in potassium hydroxide; the pressure and temperature were adjusted in the respective range of 25-40 MPa and 100-250 ℃ in tee reactor (MP2). The second one is the dehydration of the formed hydrolytic products, under the supercritical state of the solvent in the range of 25-40 MPa, 300-450 ℃ and 40-100 s in tubular flow reactor (MP3). All samples of barium hexaferrite were prepared without calcination of the dehydrated products. Using this method, smaller, uniform-size and single-phase BaFe12O19 nanocrystals could be easily obtained.
Keywords: Continuous; Mixing Point; Barium Hexaferrite; Reaction Parameter
[References]
  1. Adschiri T, Kanazawa K, Arai K, J. Am. Ceram. Soc., 75, 1019, 1992
  2. Adschiri T, Kanazawa K, Arai K, J. Am. Ceram. Soc., 75, 2615, 1992
  3. Arai K, "Science and Technology of Supercritical Fluid," Tohoku University, 1996
  4. Fujiwara T, IEEE Trans. Magn., 5, 1480, 1985
  5. Hakuta Y, Adschiri T, Suzuki T, Chida T, Seino K, Arai K, J. Am. Ceram. Soc., 81, 2461, 1998
  6. Hakuta Y, Onai S, Terayama H, Adschiri T, Arai K, J. Mater. Sci. Lett., 17(14), 1211, 1998
  7. Kumazawa H, Cho HM, Sada E, J. Mater. Sci., 28, 5247, 1993
  8. Tumazawa H, Maeda Y, Sada E, J. Mater. Sci. Lett., 14(1), 68, 1995
  9. Nam SC, Park SD, Kim GJ, J. Ind. Eng. Chem., 7(1), 38, 2001
  10. Rho S, Park S, Korean J. Chem. Eng., 19(1), 120, 2002
  11. Sada E, Kumazawa H, Cho HM, Ind. Eng. Chem. Res., 30, 1319, 1991
  12. Wang ML, Shih ZW, Lin CH, J. Cryst. Growth, 139, 47, 1994
[Cited By]
  1. Aydogan S, Kusefoglu S, Akman U, Hortacsu O, Korean Journal of Chemical Engineering, 23(5), 704, 2006
  2. Lee JH, Ham JY, Korean Journal of Chemical Engineering, 23(5), 714, 2006
  3. Yoon MJ, In JH, Lee HC, Lee CH, Korean Journal of Chemical Engineering, 23(5), 842, 2006
  4. Yoon MJ, Bae YS, Son SH, Lee JW, Lee CH, Korean Journal of Chemical Engineering, 24(5), 877, 2007
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