The effect of changing the nano size on the absorption coefficient and the energy gap of crushed Na Cl samples. Eurasian Journal of Physics,Chemistry and Mathematics, [S. l.], v. 7, p. 1–13, 2022. Disponível em: https://geniusjournals.org/index.php/ejpcm/article/view/1609. Acesso em: 20 jan. 2026.