“…These factors will affect crystallinity, particle size, shape, and distribution of particles characterized by the differences in hematite color (Pramanik et al, 2005). Synthesis of iron oxide nanoparticle hematite has been carried out using several methods, including the precipitation-calcination route (Aji et al, 2007;Khoiroh, 2019), hydrothermal (He et al, 2016;Khalil et al, 2014), sol-gel (Dar et al 2007), and ultrasonic sonochemistry (Hassanjani-Roshan et al, 2011). The sonication method is the easiest and most effective method for large-scale production with precise size control, high morphology, and crystallinity (Khalil et al, 2017).…”