Nuclear Quadrupole Moment of ${\mathrm{Al}}^{27}$ in ${\mathrm{Al}}_2$${\mathrm{O}}_3$

The electric field gradient at the Al site in corundum has been estimated considering the Al-${\mathrm{O}}_6$ complex embedded in ${\mathrm{Al}}_2$ ${\mathrm{O}}_3$. The complete metal-ion-ligand overlaps have been taken into account. Our results in conjunction with the observed quadrupole coupling constant yield the value 0.148 b for the quadrupole moment of ${\mathrm{Al}}^{27}$, which is in very good agreement with the experimental value 0.149 b.