Magnesium- and copper-substituted strontium–aluminium–hexaferrite (SrAl2Fe10O19): synthesis and scrutiny.

The strontium–aluminium–hexaferrite was substituted with the divalent ions (Mg/Cu) with the chemical formula of Sr1–xMxAl2Fe10O19 (M = Mg, Cu; x = 0.1, 0.2), and all the samples were synthesized via sol–gel auto combustion method. The thermal studies disclosed endothermic and exothermic peaks and showed magnetic phase transition behaviour in the range of 350–450 °C. The particles are shaped in a hexagonal structure with space group P63/mmc and the crystallize size ranges between 44 and 53 nm. The field-emission scanning microscopy revealed the platelet-like morphology of the particles. The magnetic studies disclosed the fine range of magnetic saturation (40.87–49.76 emu/g) and coercivity values (4619–7647 Oe). The particles own single-domain arrangement and decent energy product value (0.32–0.38 MGOe), implying their potential application in permanent magnets. The lower dielectric constant values at high-frequency range suggest their potential employment in microwave applications. [ABSTRACT FROM AUTHOR]