Hostname: page-component-848d4c4894-xfwgj Total loading time: 0 Render date: 2024-07-05T17:47:48.496Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermal instability of Co-substituted barium hexaferrites with U-type structure

Published online by Cambridge University Press:  01 February 2006

Darja Lisjak ,
Paul McGuiness  and
Miha Drofenik
Darja Lisjak*
Affiliation:
Advanced Materials Department, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Paul McGuiness
Affiliation:
Department for Nanostructured Materials, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Miha Drofenik
Affiliation:
Advanced Materials Department, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Thermal stability studies of Co-substituted barium hexaferrites with the U-type structure are reported. Samples were prepared using solid-state reaction and high-energy milling at 1300 and 1250 °C, respectively. The influence of different annealing conditions on their compositions and magnetic properties was studied. Thermal instability of the studied compounds was observed at as low as 600 °C. Through x-ray powder diffraction, chemical analysis, and thermomagnetic measurements it was confirmed that a degradation of the U-hexaferrites occurred during the annealing at 600–800 °C. The observed changes in the samples’ phase compositions and structures did not have a significant influence on their magnetization and microwave properties.

Keywords

AnnealingMagnetic propertiesSecond phases
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 420 - 427
Copyright
Copyright © Materials Research Society 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Smit, J. and Wijn, H.P.J.: Ferrites (Philips Technical Library, Eidenhoven, The Netherlands 1959), Chaps. IX, XIII, XIV.Google Scholar
2.Pollert, E.: Crystal chemistry of magnetic oxides part 2: Hexagonal ferrites. Prog. Crystal Growth and Charact. 11, 155 (1985).CrossRefGoogle Scholar
3.Kohn, J.A., Eckart, D.W., Cook, C.F. Jr.: Crystallography of the hexagonal ferrites. Science 172, 519 (1971).CrossRefGoogle ScholarPubMed
4.Gorter, E.W.: Saturation magnetization of some ferrimagnetic oxides with hexagonal crystal structures. Proc. IEEE 104B, 255 (1957).Google Scholar
5.Autissier, D., Podembski, A. and Jacquiod, C.: Microwave properties of M and Z type hexaferrites. J. Phys. IV France 7, C1-409 (1997).CrossRefGoogle Scholar
6.Zhang, H., Li, L., Zhou, J., Yue, Z. and Gui, Z.: Low-temperature sintering, densification, and properties of Z-type hexaferrite with Bi2O3 additives. J. Am. Ceram. Soc 84, 2889 (2001).Google Scholar
7.Kerecman, A.J., Tauber, A., AuCoin, T.R. and Savage, R.O.: Magnetic properties of Ba4Zn2Fe36O60 single crystals. J. Appl. Phys. 39, 726 (1968).Google Scholar
8.Pullar, R.C. and Bhattacharya, A.K.: The synthesis and characterization of Co2X (Ba2Co2Fe28O46) and Co2U (Ba4Co2Fe36O60) ferrite fibers, manufactured from a sol-gel process. J. Mater. Sci. 36, 4805 (2001).CrossRefGoogle Scholar
9.Xiong, G., Xu, M. and Mai, Z.: Magnetic properties of Ba4Co2Fe36O60 nanocrystals prepared through a sol-gel method. Solid State Comm 118, 53 (2001).CrossRefGoogle Scholar
10.Zhang, H., Liu, Z., Yao, X., Zhang, L. and Wu, M.: Complex permitivity and permeability of Ba4Zn2−zCozFe36O60 U-type hexaferrites prepared by citrate sol-gel on composition, annealing temperature and frequency. Mater. Sci. Eng. B 97, 160 (2003).Google Scholar
11.Lisjak, D. and Drofenik, M.: The thermal stability range and magnetic properties of U-type hexaferrites. J. Magn. Magn. Mater. 272–276, 1817 (2004).Google Scholar
12.Lisjak, D., Makovec, D. and Drofenik, M.: Formation of U-type hexaferrites. J. Mater. Res. 19, 2462 (2004).CrossRefGoogle Scholar
13.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, A. (The Japan Society of Powder Metallurgy, 8th International Conference on Ferrites, Kyoto, Japan, 2000), p. 939.Google Scholar
14.Tachibana, 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
15.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
16.Pawley, G.S.: Unit-cell refinement from powder diffraction scans. J. Appl. Crystallogr. 14, 357 (1981).Google Scholar
17.Reddy, V.D. and Reddy, P.V.: Thermopower studies of some cobalt-substituted BaZn–W hexagonal ferrites. Phys. Status Solidi. 142, 451 (1994).CrossRefGoogle Scholar
18.Jacquid, C. and Autissier, D.: Rare-earth substitutions in Z-type hexaferrites. J. Magn. Magn. Mater. 104–107, 419 (1992).CrossRefGoogle Scholar
19.Wang, X., Ren, T., Li, L., Gui, Z., Su, S., Yue, Z. and Zhou, J.: Synthesis of Cu-modified Co2Z hexaferrite with planar structure by a citrate precursor method. J. Magn. Magn. Mater. 234, 225 (2001).CrossRefGoogle Scholar
20.Sudakar, C., Subbana, G.N. and Kutty, T.R.N.: Hexaferrite-FeCo nanocomposite particles and their electrical and magnetic properties at high frequencies. J. Appl. Phys. 94, 6030 (2003).CrossRefGoogle Scholar
21.Lisjak, D., Makovec, D. and Drofenik, M. The defect structure of U-type hexaferrites, in Nanoscale Magnetic Oxides and Bio-World, edited by Nedkov, I. and Tailhades, Ph. (Heron Press, Sofia, Bulgaria, 2004), p. 75.Google Scholar
22.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
23.Lu, H-X., Du, Y-W., Wang, T-X., Hu, H-Q. and Xue, R-H.: A study of the (ZnxFe1−x)2W ferrites. Adv. Ceram. 16(part II), 561 (1984).Google Scholar
24.Lisjak, D. and Drofenik, M.: The preparation of single-domain barium hexaferrites using coprecipitation in ethanol, in Proceedings of the Ninth International Conference on Ferrites (ICF-9), edited by Soohoo, R.F.. (Am. Ceram. Soc., Westerfille, OH, 2005), p. 665.Google Scholar
25.Makovec, D. and Drofenik, M.: The preparation of Ba hexaferrite nanoparticles in water-CTAB-hexanol microemulsions, in Proceedings of the Ninth International Conference on Ferrites (ICF-9), edited by Soohoo, R.F. (Am. Ceram. Soc., Westerville, OH, 2005), p. 823.Google Scholar
26.Goto, Y. and Takada, T.: Phase diagram of the system BaO–Fe2O3. J. Am. Ceram. Soc. 43, 150 (1960).CrossRefGoogle Scholar
27.Roos, W.: Formation of chemically coprecipitated barium ferrite. J. Am. Ceram. Soc. 63, 601 (1980).CrossRefGoogle Scholar
28.Sankaranarayanan, V.K., Pankhurst, Q.A., Dickson, D.P.E. and Johnson, C.E.: Ultrafine particles of barium ferrite from a citrate precursors. J. Magn. Magn. Mater. 120, 73 (1993).Google Scholar
29.Chin, T-S., Hsu, S.L. and Deng, M.C.: Barium ferrite particulates by a salt-melt method. J. Magn. Magn. Mater. 120, 64 (1993).CrossRefGoogle Scholar
30.Shannon, R.D.: Revised effective ionic radii and systematic studies of Interatomic distances in halides and chalcogenides. Acta Crystallogr. A 32, 751 (1976).CrossRefGoogle Scholar
31.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