A novel sol-gel auto-combustion method has been used to synthesize
ultra-fine particles of strontium hexaferrite. The gels were prepared
from metal nitrates and citric acid by various molar ratios of Fe/Sr and
trimethylamine as pH adjusting agent. The results showed that the gel
exhibits a self-propagating behavior after ignition in air. The
combustion product was calcined at 800 °C to form strontium
hexaferrite. The obtained powders were characterized by XRD, SEM
and FTIR techniques. The optimum molar ratio was Fe/Sr=10 with
crystallite size about 37 nm. The FTIR and XRD results showed that
the combustion product contains ? -Fe2O3 as the main phase and some
amount of SrCO3 and ? -Fe2O3
', './data/iijs/coversheet/cover_en.jpg'))