Kurniawidi, Dian, Kormil Saputra, Teguh Ardianto, Rahmatun Inayah, and Ika Aminy. “UV-Vis Spectroscopic Analysis for Band Gap Determination of Cobalt-Doped Magnetite (Fe2.5Co0.5O4) Nanoparticles Derived from Natural Iron Sand”. KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA 10, no. 2 (May 21, 2026): 115-125. Accessed May 30, 2026. https://www.jurnalkonstan.ac.id/index.php/jurnal/article/view/786.