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Benefits of Mild Wet Milling of the Intermediates for the Synthesis of Phase-pure Z-type Hexaferrite

Published online by Cambridge University Press:  01 August 2005

Jadambaa Temuujin ,
Masami Aoyama ,
Mamoru Senna ,
Taisuke Masuko ,
Chie Ando  and
Hiroshi Kishi
Jadambaa Temuujin*
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Masami Aoyama
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Mamoru Senna
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Taisuke Masuko
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
Chie Ando
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
Hiroshi Kishi
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
*
a) Address all correspondence to this author. e-mail: jtemuujin@yahoo.com
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Abstract

A comparative study on the wet and dry milling of the intermediates for the Z-type hexagonal ferrite (Ba3Co2Fe24O41, Z phase) was performed. Phase-pure Z phase was synthesized by wet milling the intermediates comprising M and Y-type hexaferrites. The intermediates were obtained by calcining the stoichiometric powder mixture at 1080 °C. Subsequent wet milling by a planetary mill for 1 h increased the crystallization rate of Z phase upon subsequent heating at 1230 °C. In contrast, dry milling the intermediates resulted in the severe surface amorphization and led to heterogeneous crystalline states. The observed favorable effect of wet milling the intermediates was explained by the particle size reduction for the decrease of diffusion distance while preserving the basic layer units common to the related hexaferrites.

Keywords

CeramicMicrostructurePowder processing
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 1939 - 1942
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Smith, J. and Wiji, H.P.J.: Ferrites (Philips Technical Library, Eindhoven, The Netherlands, 1959), p. 268.Google Scholar
2Wang, X., Li, L., Gui, Z., Shu, S. and Zhou, J.: Preparation and characterizations of ultrafine hexagonal ferrite Co2Z powders. Mater. Chem. Phys. 77, 248 (2002).CrossRefGoogle Scholar
3Xiong, G., Wei, G., Yang, X., Lu, L. and Wang, X.: Characterization and size-dependent magnetic properties of Ba3Co2Fe24O41 nanocrystals synthesized through a sol-gel method. J. Mater. Sci. 35, 931 (2000).CrossRefGoogle Scholar
4Pullar, R.C., Appleton, S.G., Stacey, M.H., Taylor, M.D. and Bhattacharya, A.K.: The manufacture and characterization of aligned fibres of the ferroxplana ferrites Co2Z, 0.67%CaO-doped Co2Z, Co2Y and Co2W. J. Magn. Magn. Mater. 186, 313 (1998).CrossRefGoogle Scholar
5Zhang, H., Li, L., Zhou, J., Yue, Z., Ma, Z. and Gui, Z.: Microstructure characterization and properties of chemically synthesized Co2Z hexaferrite. J. Eur. Ceram. Soc. 21, 149 (2001).CrossRefGoogle Scholar
6Vinnik, M.A.: Phase relationships in the BaO–CoO–Fe2O3 system. Russ. J. Inorg. Chem. 9, 1164 (1965).Google Scholar
7Nakamura, T. and Hankui, E.: Control of high-frequency permeability in polycrystalline (Ba,Co)-Z-type hexagonal ferrite. J. Magn. Magn. Mater. 257, 158 (2003).CrossRefGoogle Scholar
8Tachibana, T., Nakagawa, T., Takada, Y., Izumi, K., Yamamoto, T.A., Shimada, T. and Kawano, S.: X-ray and neutron diffraction studies on iron-substituted Z-type hexagonal barium ferrite: Ba3Co2−xFe24+xO41 (x = 0–0.6). J. Magn. Magn. Mater. 262, 248 (2003).CrossRefGoogle Scholar
9Senna, M.: Incipient chemical interaction between fine particles under mechanical stress-feasibility of producing advanced materials via mechanochemical routes. Solid State Ionics 63–65, 3 (1993).CrossRefGoogle Scholar
10Temuujin, J.: Mechanochemical treatment of solid mixtures-a promising way of synthesizing ceramic precursors. Chem. Sustainable Dev. 9, 589 (2001).Google Scholar
11Temuujin, J., Aoyama, M., Senna, M., Masuko, T., And, C.o, and Kishi, H.: (unpublished).Google Scholar
12Temuujin, J., Aoyama, M., Senna, M., Masuko, T., Ando, C. and Kishi, H.: Synthesis of Y type hexaferrites via a soft mechanochemical route. J. Solid State Chem. 177, 3903 (2004).CrossRefGoogle Scholar
13 JCPDS Catalog, Vol. 19, Card 97.Google Scholar