Abstract
Rare-earth-doped ferrites with the general formula M1 – x R x · nFe2O3 (M = Ba, Sr, Pb; R = La, Ce; x = 0–0.1; n = 4–6) are prepared by solid-state combustion synthesis. The effects of the doping procedure (before or after combustion synthesis), dopant content, and heat-treatment conditions on the magnetic and mechanical properties of the ferrites are examined. The results indicate that doped materials can be used to fabricate permanent magnets with enhanced density, remanence, and energy product. In addition, rare-earth doping improves the strength of the ferrite materials, eliminating their main drawback—inherent brittleness.
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REFERENCES
Tret'yakov, Yu.D. and Lepis, Kh., Khimiya i tekhnologiya tverdofaznykh materialov (Chemistry and Technology of Solids), Moscow: Mosk. Gos. Univ., 1985.
Letyuk, L.M., Balbashov, A.M., Krutogin, D.G., et al., Tekhnologiya proizvodstva materialov magnitoelektroniki (Technology of Magnetoelectronic Materials), Moscow: Metallurgiya, 1994.
Parker, R.J., Advances in Permanent Magnetism, New York: Wiley, 1990.
Campbell, P., Permanent Magnet Materials and Their Application, Cambridge: Cambridge Univ. Press, 1994.
Merzhanov, A.G., Protsessy goreniya i sintez materialov (Combustion Processes and Synthesis of Materials), Chernogolovka: Inst. Strukturnoi Makrokinetiki Ross. Akad. Nauk, 1998.
Martirosyan, K.S., Avakyan, P.B., Morozov, Yu.G., et al., Self-Propagating High-Temperature Synthesis of Barium Hexaferrite, Preprint of Inst. of Structural Macrokinetics, USSR Acad. Sci., Chernogolovka, 1990.
Nersesyan, M.D., Avakyan, P.B., Martirosyan, K.S., et al., Self-Propagating High-Temperature Synthesis of Ferrites, Neorg. Mater., 1993, vol. 29, no. 12, pp. 1674-1677 [Inorg. Mater. (Engl. Transl.), vol. 29, no. 12, pp. 1506-1508].
Martirossian, K.S., Avakyan, P.B., and Nersesyan, M.D., Synthesis of Lead Ferrite in a Combustion Mode, Int. J. Self-Propag. High-Temp. Synth., 2001, vol. 10, no. 2, pp. 193-199.
Martirosyan, K.S., Avakyan, P.B., and Nersesyan, M.D., Phase Formation during Self-Propagating High-Temperature Synthesis of Ferrites, Neorg. Mater., 2002, vol. 38, no. 4, pp. 489-492 [Inorg. Mater. (Engl. Transl.), vol. 38, no. 4, pp. 400-403].
Parkin, I.P., Pankhurst, Q.A., Affleck, L., et al., Self Propagating High Temperature Synthesis of BaFe12O19, Mg0.5Zn0.5Fe2O4, and Li0.5Fe2.5O4: Time Resolved X-ray Diffraction Studies (TRXRD), J. Mater. Chem., 2001, no. 11, pp. 193-199.
Frantsevich, I.N. and Tul'chinskii, L.N., Lanthanum-Substituted Barium Hexaferrites, Poroshk. Metall. (Kiev), 1971, vol. 98, no. 2, pp. 63-69.
Berezhak, O.F., Shipko, M.N., Letyuk, L.M., and Tikhonov, V.S., Structure of Doped Barium Hexaferrite, Izv. Akad. Nauk SSSR, Neorg. Mater., 1984, vol. 20, no. 5, pp. 865-867.
Yamamoto, H. and Nagakura, M., High Quality Anisotropic Lead System Ferrite Magnets, IEEE Trans. Magn., 1987, vol. 23, no. 1, pp. 294-299.
Martirosyan, K.S., Self-Propagating High-Temperature Synthesis of Hard-Magnetic Ferrites, Poroshkovaya metallurgiya na poroge 3 tysyacheletiya (Powder Metallurgy on the Eve of the Third Millennium), Manukyan, N.V., Ed., Yerevan: Tigran Mets, 2000, pp. 149-170.
Metallovedenie i termicheskaya obrabotka stali. Metody ispytanii i issledovaniya: Spravochnik (Physical Metallurgy and Heat Treatment of Steel: A Handbook of Test Procedures and Investigation Techniques), Bernshtein, M.P., Ed., Moscow: Metallurgiya, 1983, vol. 1.
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Martirosyan, K.S., Martirosyan, N.S. & Chalykh, A.E. La3+ and Ce3+ Doping of Hard-Magnetic Ferrites. Inorganic Materials 40, 527–532 (2004). https://doi.org/10.1023/B:INMA.0000027601.25937.82
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DOI: https://doi.org/10.1023/B:INMA.0000027601.25937.82