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Formation of U-type hexaferrites

Published online by Cambridge University Press:  03 March 2011

Darja Lisjak ,
Darko Makovec  and
Miha Drofenik
Darja Lisjak*
Affiliation:
“Jožef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
Darko Makovec
Affiliation:
“Jožef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
Miha Drofenik
Affiliation:
“Jožef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
*
a) Address all correspondence to this author. e-mail: darja.lisjak@ijs.si
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Abstract

The formation of U-type hexaferrites with the composition Ba4B2Fe36O60 (B = Co, Ni, Zn) was studied. Samples were characterized by means of x-ray diffraction, electron microscopy (with energy-dispersive spectroscopy), and thermogravimetric and thermomagnetic analyses. U-hexaferrites are formed from the intermediate phases M-hexaferrite (BaFe12O19) and Y-hexaferrite (Ba2B2Fe12O22), which at the same time represent units in the U-hexaferrites’ crystal structure. The preparation of monophase U-hexaferrites was made possible by combining high-energy milling or chemical coprecipitation with a calcination at 1250–1300 °C. Structural defects, such as stacking faults, were observed in monophase samples with a high-resolution transmission electron microscope. The observed defects can be regarded as seeds for the formation of other hexaferrite phases after prolonged calcination times or higher calcination temperatures.

Keywords

Powder processingMagneticTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2462 - 2470
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

1.Smit, J. and Wijn, H.P.J., Ferrites (Philips' Technical Library, Eidenhoven, The Netherlands, 1959), Chap. IX.Google Scholar
2.Valenzuela, R., Magnetic Ceramics (Cambridge University Press, Cambridge, U.K., 1994), Chap. 2.3.CrossRefGoogle Scholar
3.Kohn, J.A., Eckart, D.W., and Cook, C.F. Jr.: Crystallography of the hexagonal ferrites. Science. 172, 519 (1971).CrossRefGoogle ScholarPubMed
4.Pollert, E.: Crystal chemistry of magnetic oxides Part 2: Hexagonal ferrites. Prog. Cryst. Growth Charact. 11, 155 (1985).CrossRefGoogle Scholar
5.Kerecman, J., Tauber, A., Aucoin, T.R. and Savage, R.O.: Magnetic properties of Ba4Zn2Fe36O60 single crystals. J. Appl. Phys. 39, 726 (1968).CrossRefGoogle Scholar
6.Pullar, R.C. and Bhattacharya, A.K.: The synthesis and characterization of Co2X (Ba2Co2Fe28O46) and Co2U (Ba4Co2Fe36O60) ferrite fibres, manufactured from a sol-gel proces. J. Mater. Sci. 36, 4805 (2001).Google Scholar
7.Xiong, G., Xu, M. and Mai, Z.: Magnetic properties of Ba4Co2Fe36O60 nanocrystals prepared through a sol-gel method. Solid State Commun. 118, 53 (2001).Google Scholar
8.Lisjak, D. and Drofenik, M.: Synthesis and characterization of Zn2U (Ba4Zn2Fe36O60) hexaferrite powder. J. Appl. Phys. 93, 8011 (2003).CrossRefGoogle Scholar
9.Lisjak, D. and Drofenik, M.: The thermal stability range and magnetic properties of U-type hexaferrites. J. Magn. Magn. Mater. 272–276,1817 (2004).CrossRefGoogle Scholar
10.Pawley, G.S.: Unit-cell refinement from powder diffraction scans. J. Appl. Crystallogr. 14, 357 (1981).CrossRefGoogle Scholar
11.Kuznetsova, S.I., Naiden, E.P. and Stepanova, T.N.: Topotactic reaction kinetics in the formation of the hexagonal ferrite Ba3Co2Fe24O41. Inorg. Mater. (Transl. Neorg. Mater.) 24, 856 (1988).Google Scholar
12.Vinnik, M.A., Aragonavskaya, A.I. and Semenova, N.N.: Phase relations during formation of barium cobalt hexaferrite Ba3Co2Fe24O41 (Co2Z), studied by X-ray diffraction and microstructural methods. Inorg. Mater. (Transl. Neorgan. Mater.) 1, 1078 (1965).Google Scholar
13.Sudakar, C., Subbana, G.N. and Kutty, T.R.N.: Wet chemical synthesis of multitcomponent hexaferrites by gel-to-crystallite conversion and their magnetic properties. J. Magn. Magn. Mater. 263, 253 (2003).CrossRefGoogle Scholar
14.Šimša, Z., Zalesskij, A.V. and Zaveta, K.: Electrical properties of single crystals of hexagonal ferrites with W structure. Phys. Stat. Sol. 14, 485 (1966).CrossRefGoogle Scholar
15.van Landuyt, J., Amelickx, S., Kohn, J.A. and Eckart, D.W.: Multiple beam direct lattice imaging of the hexagonal ferrites. J. Solid State Chem. 9, 103 (1974).CrossRefGoogle Scholar
16.Hirotsu, Y. and Sato, H.: Microsyntactic intergrowth and defects in barium ferrite compounds. J. Solid State Chem. 26, 1 (1978).CrossRefGoogle Scholar
17.MaConnell, J.D.M., Hutchinson, J.L. and Anderson, J.S.: Electron microscopy of the barium ferrite layer structures. Proc. R. Soc. Lond. Ser. A 339, 1 (1974).Google Scholar
18.Nicolopoulos, S., Vallet-Regi, M. and Gonzales-Calbet, J.M.: HREM study and structure analysis of the Z(Ba3Cu2Fe24O41) hexagonal ferrite. Mater. Res. Bull. 25, 845 (1990).CrossRefGoogle Scholar
19.Nicolopoulos, S., Vallet-Regi, M. and Gonzalez-Calbet, J.M.: Microstructural study of hexaferrite related compounds: Z(Ba3Cu2Fe24O41) and BaFe2O4 phase. Mater. Res. Bull. 25, 567 (1990).CrossRefGoogle Scholar
20.Tachibana, T., Ohta, K., Shimada, T., Nakagawa, T., Yamamotto, T., and Katsura, M.: Study of thermally stable range and magnetic property of Z-type hexagonal ferrite: Ba3Co2-xFexFe24O41, in Digest of the 8th International Conference on Ferrites, edited by Yamazaki, Abe (The Japan Society of Powder and Powder Metallurgy, 8th International Conference on Ferrites,Kyoto, Japan, 2000), p. 19.Google Scholar
21.Hiratsuka, N., Ikeda, R., Wada, R., and Kakizaki, K.: Effects of substitution on high frequency characteristics for Co2Z hexagonal ferrite, in Proceedings of the 8th International Conference on Ferrites (8th International Conference on Ferrites,Kyoto, Japan, 2000), p. 939.Google Scholar
22.Chen, I-G., Hsu, S-H. and Chang, Y.H.: Preparation and magnetic properties of Ba-Co2Z and Sr-Zn2Y ferrites. J. Appl. Phys. 87, 6247 (2000).Google Scholar
23.Castelliz, L.M., Kim, K.M. and Boucher, P.S.: Preparation, stability range and high frequency permeability of some ferroxplana compounds. J. Can. Ceram. Soc. 38, 57 (1969).Google Scholar
24.Lubitz, P. and Rachford, F.J.: Z type Ba hexagonal ferrites with tailored microwave properties. J. Appl. Phys. 91, 7613 (2002).CrossRefGoogle Scholar
25.Sakaguchi, O., Kagotani, T., Book, D., Nakamura, H., Sugimoto, S., Okada, M. and Homma, M.: Synthesis and magnetic properties of ferroxplana type ferrite. Mater. Trans. 37, 878 (1996).Google Scholar
26.Neumann, H. and Wijn, H.P.J.: Polycrystalline hexagonal Fe2W with varying ferrous content. J. Am. Ceram. Soc. 51, 536 (1968).CrossRefGoogle Scholar
27.Collomb, A., Mignot, J.P. and Allain, Y.: Stability of monovalent copper in the W-type hexagonal ferrite: Ba(Cu+Fe3+)Fe16O27. J. Magn. Magn. Mater. 61, 4 (1986).Google Scholar
28.Lotgering, F.K. and Vromans, P.H.G.: Chemical stability of metal-deficient hexagonal ferrites with W structure. J. Am. Ceram. Soc. 60, 416 (1977).CrossRefGoogle Scholar
29.Hujiser-Gerits, E.M.C. and Rieck, G.D.: Changes in microstructure of oriented Ba3Co2Fe24O41 material during sintering II. J. Appl. Crystallogr. 9, 18 (1976).CrossRefGoogle Scholar
30.Vinnik, M.A., Aragonavskaya, A.I. and Semenova, N.N.: X-ray diffraction and microstructural investigation of phase relations in the formation of the barium cobalt hexagonal ferrite BaCo2Fe16O27. Rus. J. Inorg. Chem. (Transl. Z. Neorg. Chim.) 12, 18 (1967).Google Scholar