Synthesis Temperature Affects the Crystalline and Magnetic Properties of Strontium-Modified Cobalt Ferrite Nanoparticles

Abstract

Effect of the synthesis temperature on strontium-modified cobalt ferrite nanoparticles using co-precipitation method has been conducted. Molarity composition of strontium is 10%, chosen to substitute in the cobalt ferrite nanoparticles. Synthesis temperature treatment (75 °C, 85 °C, and 95 °C) is tuned the crystalline structures and magnetic properties of the cobalt ferrite nanoparticles. XRD result showed that the pattern of characteristics appropriates ICDD 22-1086, which describes that all peaks are pristine cobalt ferrite. Furthermore, crystallite size decreases with increasing synthesis temperature, i.e., 25.32 nm, 23.55 nm, and 22.65 nm at the temperatures of 75 °C, 85 °C, and 95 °C, respectively. FTIR obtained shows an absorption band at around 590 cm -1 (tetrahedral site) and 387 cm -1 (octahedral site), which is absorption from the original cobalt ferrite. VSM test also revealed changing magnetic properties with synthesis temperature treatment. In addition, squareness ratio showed that the magnitudes were greater than 0.5, which indicates single-domain magnetic. Hence, the adjustment of the synthesis temperature at 95 °C has the highest potential to advance applications such as photocatalytic and/or antibacterial due to its smallest crystallite size.