the effect of doping ratio on the opical properties. Baghdad Science Journal, Iraq, Baghdad, v. 3, n. 1, p. 180–186, 2006. DOI: 10.21123/bsj.2006.692. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/692.. Acesso em: 3 jul. 2024.