Arsyad, Y.M., Mega Nurhanisa, Elsa Narulita, Ayunda Dwi Handayani, Frinelda Rehulina Barus, Tri Rahma Febrianti Maharani, Hilyana Agis Risla, Latifah Tri Amanda, Delia Amanda and Zahraini Tasya Siregar 2025. Dependence of Crystallinity and Crystallite Size of Hydroxyapatite from Chicken Eggshell on Calcination Time : A Comparative Study on Scherrer Approach . Newton-Maxwell Journal of Physics. 6, 2 (Oct. 2025), 79–86. DOI:https://doi.org/10.33369/nmj.v6i2.43228.