The diffraction peaks can be indexed to the cubic lattice of MgO (JCPDS No. 4-829), with the characteristic peaks at (111), (200), (220), (311), and (222).
Nevertheless, for three samples prepared with CTAB, a small reflection at (110) was detected, prompting Mg(OH)2 existence as an
impurity phase (JCPDS No. 44-1482)