Effect of Heat Treatment on Microstructure and Magnetic Properties of Strontium Hexaferrite Nanoparticles Prepared in Presence of Non-Ionic Surfactant

Abstract:

SrFe₁₂O₁₉ hexaferrite particles containing polyoxyethelene (20) sorbitan monolate (Tween-80) were synthesized by a chemical co-precipitation technique with a precipitator NH₃.H₂O. The prepared Sr-M hexaferrite precipitates were heat treated at various temperatures 650 oC, 750 oC, 850 oC, 950oC and 1100oC for 4 hrs in a muffle furnace. The obtained Sr-M powders were characterized by using various instrumental techniques, like FTIR, TGA, XRD, SEM, VSM and Mössbauer spectroscopy. Their physical as well as Magnetic properties were compared. It was observed from XRD results that heat treatment conditions play significant role in the formation of pure SrFe₁₂O₁₉ hexaferrite phase and also in the grain size. The estimated particle size is of the order of nanometer when suitable calcination temperature is applied. SEM micrographs show an increase in crystallite size of the resultant SrFe₁₂O₁₉ hexaferrite particles sintered at higher temperature (1100 oC). Mössbauer spectroscopic measurements were carried out at room temperature. Mössbauer analysis indicates the presence Fe³⁺ ions in the prepared strontium hexaferrite particles.

• Periodical: Solid State Phenomena (Volume 202)
• Pages: 193-205
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.202.193
• Online since: May 2013
• Authors: Nital R. Panchal, Rajshree B. Jotania
• Keywords: Co-Precipitation Technique, Magnetic Property, SrFe₁₂O₁₉ Hexaferrite, Tween-80

References

[1] P. Campbell, Permanent Magnetic Materials and Their Applications, Cambridge University Press, Cambridge, 1994.

[2] O. Kubo, T. Ido, H. Yokohama, Properties of Ba ferrite particles for perpendicular magnetic recording media, IEEE Trans. Magn. 18 (6) (1982) 1122-1124.

DOI: 10.1109/tmag.1982.1062007

[3] E.W. Gorter, Philips Res. Rep. 9 (1954) 403.

[4] Z. Hajan, X. Yao, Z. Liangying, The preparation and microwave properties of BaZn2−ZCoZFe16O27 ferrite obtained by a sol–gel process, Ceram. Int. 28 (2) (2002) 171-175.

DOI: 10.1016/s0272-8842(01)00074-8

[5] R. Victora, Micromagnetic predictions for barium ferrite particles, J. Appl. Phys. 63 (1988) 3423-3428.

DOI: 10.1063/1.340755

[6] A. Ataie, I. Harris, C. Ponton, Magnetic properties of hydrothermally synthesized strontium hexaferrite as a function of synthesis conditions, J. Mater. Sci. 30 (6) (1995) 1429-1433.

DOI: 10.1007/bf00375243

[7] F. Walz, J. Rivas, D. Martinez, H. Kronmuller, Influence of Ba content on the magnetic after-effect spectra in barium ferrites, Physica Status Solidi (A) 143 (1) (1994) 137-148.

DOI: 10.1002/pssa.2211430118

[8] T. Sorenson, S. Morton, G. Waddill, J. Switzer, Epitaxial Electrodeposition of Fe3O4 Thin Films on the Low-Index Planes of Gold, J. Am. Chem. Soc. 124 (25) (2002) 7604-7609.

DOI: 10.1021/ja0201101

[9] V. Pankov, M. Pernet, P. Germi, P. Mollard, Fine hexaferrite particles for perpendicular recording prepared by the coprecipitation method in the presence of an inert component, J. Magn. Magn. Mater. 120 (1-3) (1993) 69–72.

DOI: 10.1016/0304-8853(93)91289-j

[10] J. Ding, W. Miao, P. McCormick, R. Street, High-coercivity ferrite magnets prepared by mechanical alloying, J. of Alloys and Compounds 281 (1) (1998) 32-36.

DOI: 10.1016/s0925-8388(98)00766-x

[11] N. Panchal, R. Jotania, Physical Properties of Strontium Hexaferrite Nano Magnetic Particles Synthesized by a Sol-Gel Auto-Combustion Process in Presence of Non Ionic Surfactant, Nanosci. Nanotech. Letters, 4 (6) (2012) 623-627.

DOI: 10.1166/nnl.2012.1361

[12] V. Constantino, T. Pinnavaia, Basic Properties of Mg2+1-xAl3+x Layered Double Hydroxides Intercalated by Carbonate, Hydroxide, Chloride, and Sulfate Anions, Inorg. Chem. 34 (4) (1995) 883–892.

DOI: 10.1021/ic00108a020

[13] M. Salunkhe, D. Choudhry, D. Kulkarni, Infrared absorption studies of the system Sr2Me2Fe12O22 , Vibration Spectroscopy 34 (2) (2004) 221-224.

DOI: 10.1016/j.vibspec.2003.10.002

[14] J. Temuujin, M. Aoyama, M. Senna, T. Masuko, C. Ando, H. Kishi, Synthesis of Y-type hexaferrites via a soft mechanochemical route, Journal of Solid State Chemistry 177 (11) (2004) 3903-3908.

DOI: 10.1016/j.jssc.2004.06.051

[15] R. Pullar, M. Taylor, A. Bhattacharya, Aligned hexagonal ferrite fibres of Co2W, BaCo2Fe16O27 produced from an aqueous sol–gel process, J. Mater. Sci. 32 (4) (1997) 873-877.

[16] J. S. Van Wieringen, Philips Tech. Rev. 28 (1967) 33.