Strontium hexaferrite (SrFe12O19–SF6) is a magnetic material of great interest in various research fields due to its high coercive field (Hc) and its high saturation magnetization. In this research, the effect of synthesis parameters on the structure and magnetic response was studied. It was evidenced that the parameters such as pH value and iron precursor type have a strong influence on the crystalline structure of the samples, since the pure phase of strontium hexaferrite was obtained by two different pathways (ferrous and ferric) and only at pH = 5. It was determined that there are differences in the magnetic response of both samples; the ferrous pathway generates the largest values of both saturation magnetization (74.3 emu g–1) and coercive field (5.2 kOe).