The electronic charge density is very much useful to identify the nature of chemical bonding. Using the mBJ xc potential we have calculated electronic charge density in (1 0 0) and (-1 1 0) crystallographic planes (Fig. 4 a, b). The electronegativity values for Ag, Al and O are 1.93, 1.61 and 3.44 respectively. Our calculated charge density shows dominant ionic character of chemical bonding as can be seen from the spherical lines around oxygen atom. The electronegativity difference is one major tool to determine the nature of bonding. Oxygen and silver has electronegativity difference of 1.51 indicates, thus the ionicity between O-Ag is about 32.15% , therefore the covalency is 67.85%. Whereas the difference in electronegativity between oxygen and Al is 1.83 that led to increase the ionicity between O-Al to be 41.01% and reduce the covalency to 58.99% with respect to O-Ag. Due to high electronegativity of oxygen most the valence charge is transferred from Ag and Al towards oxygen site. Hence, according to thermo scale the blue color indicates maximum charge concentration