Abstract
Glass of nominal composition SrFe12O19 + 12SrB1.5Bi0.5O4 is prepared by rapid quenching from the liquid state and is converted to glass-ceramics containing fine SrFe12O19 particles by heat treatment between 600 and 850°C. The materials are characterized by Mössbauer spectroscopy, x-ray diffraction, differential thermal analysis, electron microscopy, and magnetic measurements. All of the Fe in the glass is shown to be in the oxidation state 3+. The phase transformations accompanying glass crystallization are identified. The coercive field of the samples is shown to increase from 188 to 504 kA/m as the heat-treatment temperature is raised from 600 to 850°C. The composite prepared by heat treatment at 850°C contains submicron-sized SrFe12O19 particles with a thickness-to-diameter ratio of 0.33.
Similar content being viewed by others
REFERENCES
Comstock, R.L., Modern Magnetic Materials in Data Storage, J. Mater. Sci., 2002, vol. 13, no. 9, pp. 509–523.
Shirk, B.T. and Buessem, W.R., Temperature Dependence of M s and K 1 of BaFe 12 O 19 and SrFe 12 O 19 Single Crystals, J. Appl. Phys., 1969, vol. 40, no. 3, pp. 1294–1296.
Morisako, A., Naka, T., Ito, K., et al., Properties of Ba-Ferrite/ AlN Double Layered Films for Perpendicular Magnetic Recording Media, J. Magn. Magn. Mater., 2002, vols. 242–245, pp. 304–310.
Lee, C.-K. and Speyer, R.F., Glass Formation and Crystallization of Barium Ferrite in the Na 2 O–BaO–Fe 2 O 3 – SiO 2 System, J. Mater. Sci., 1994, vol. 29, no. 5, pp. 1348–1351.
Mueller, R., Ulbrich, C., Schueppel, W., et al., Preparation and Properties of Barium-Ferrite-Containing Glass Ceramics, J. Eur. Ceram. Soc., 1999, vol. 19, no. 6/7, pp. 1547–1550.
Sohn, S.-B., Choi, S.-Y., and Shim, I.-B., Preparation of Ba-Ferrite Containing Glass-Ceramics in BaO–Fe 2 O 3 – SiO 2, J. Magn. Magn. Mater., 2002, vol. 239, nos. 1–3, pp. 533–536.
Johri, U.C., Singru, R.M., and Bahadur, D., Moessbauer Spectroscopic Studies of Glass Ceramics with Hexagonal Barium and Strontium Ferrites, J. Mater. Sci., 1992, vol. 27, no. 22, pp. 6223–6228.
Sato, H. and Umeda, T., Grain Growth of Strontium Fer-rite Crystallized from Amorphous Phases, Mater. Trans., JIM, 1993, vol. 34, no. 1, pp. 76–81.
Zaitsev, D.D., Kazin, P.E., Garshev, A.V., et al., Synthesis and Magnetic Properties of SrO–Fe 2 O 3 –B 2 O 3 Glass-Ceramics, Neorg. Mater., 2004, vol. 40, no. 8, pp. 1009–1013 [Inorg. Mater. (Engl. Transl.), vol. 40, no. 8, pp. 881–885].
Zaitsev, D.D., Kazin, P.E., Tret'yakov, Yu.D., and Jansen, M., Phase Relations in the SrO–B 2 O 3 –Fe 2 O 3 System, Zh. Neorg. Khim., 2003, vol. 48, no. 11, pp. 1869–1871.
Zaitsev, D.D., Kazin, P.E., Tret'yakov, Yu.D., and Jansen, M., Phase Relations in the SrO–Bi 2 O 3 –Fe 2 O 3 Sys-tem, Neorg. Mater., 2003, vol. 39, no. 12, pp. 1522–1526 [Inorg. Mater. (Engl. Transl.), vol. 39, no. 12, pp. 1319–1323].
Moreau, J.M., Michel, C., Gerson, R., and James, W.J., Ferroelectric BiFeO 3 X-ray and Neutron Diffraction Study, J. Phys. Chem. Solids, 1971, vol. 32, no. 9, pp. 1315–1320.
Yoo, J., Koshikawa, N., Arai, Y., et al., Containerless Solidification of Oxide Material Using an Electrostatic Levitation Furnace in Microgravity, J. Cryst. Growth, 2001, vol. 231, no. 4, pp. 568–576.
Obrados, X., Solans, X., Collomb, A., et al., Crystal Structure of Strontium Hexaferrite SrFe 12 O 19, J. Solid State Chem., 1988, vol. 72, no. 1, pp. 218–224.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zaitsev, D.D., Kazin, P.E., Tret'yakov, Y.D. et al. Synthesis and Magnetic Properties of SrO–Fe2O3–B2O3–Bi2O3 Glass-Ceramics. Inorganic Materials 40, 1111–1115 (2004). https://doi.org/10.1023/B:INMA.0000046479.10460.9c
Issue Date:
DOI: https://doi.org/10.1023/B:INMA.0000046479.10460.9c