An investigation on physical properties of strontium hexaferrite nanopowder synthesized by a sol–gel auto-combustion process with addition of cationic surfactant

• Published in: Journal of the European Ceramic Society 2007, Vol.27 (13), p.3637-3640
• Main Authors: Ghobeiti Hasab, M., Seyyed Ebrahimi, S.A., Badiei, A.
• Format: Article
• Language: English
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Electrotechnical and electronic ceramics; Exact sciences and technology; Materials science; Nano; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Physics; Sol–gel; Strontium hexaferrite; Surfactant; Technical ceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2007.02.004

In this study a novel sol–gel auto-combustion method, using n-decyltrimethylammonium bromide as a cationic surfactant, has been used to synthesize strontium hexaferrite nanocrystalline powder. The dried nitrate–citrate gel, prepared from a solution of ferric nitrate, strontium nitrate, citric acid, trimethylamine and cationic surfactant, exhibited an auto-combustion behavior after ignition in air. The formation reaction temperature, phase identification, crystallites size, particles size distribution and morphology of resultant strontium hexaferrite powder were investigated by DTA/TGA, FTIR, XRD, LPSA, TEM and SEM techniques. The results showed that in presence of the cationic surfactant, the combustion intensity increases and the crystallite size decreases. The crystallite size of strontium hexaferrite powder in sample with surfactant calcined at 800 °C was 27.2 nm.