Sr4Fe6O13 phases were prepared by employing nanoplatelets of α-Fe2O3 with appreciable magnetic properties. This is novel work based on the synthesis strategy of Sr4Fe6O13, where we have employed both the hydrothermal synthesis and subsequent annealing, followed by solid-state mixing. We have employed hydrothermal synthesis, and subsequent annealing of powders resulted in the formation of α-Fe2O3 with platelet morphology, with average particle sizes of 81(2) nm. These platelets were mixed with SrCO3 and annealed at three different temperatures of 900 °C, 1000 °C, and 1100 °C. This synthesis strategy resulted in the highest coercivity of 343 kA/m at 1000 °C. An appreciable saturation magnetization of 21 Am2/kg was obtained for the powders annealed at 1100 °C. The Rietveld modeling of the powder diffraction patterns of Sr4Fe6O13 annealed at different temperatures showed the presence of impurity phases in all the three temperatures; however, the powder annealed at 1100 °C showed highest amount of Sr4Fe6O13 with 87%. The results confirm that there is influence of SrFe12O19 on the formation of Sr4Fe6O13 phase. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.