Mössbauer measurements of the 93.26-keV transition in ${}_{}{}^{67}{}_{}{}^{}\mathrm{Zn}$ are reported for sources of ${}_{}{}^{67}{}_{}{}^{}\mathrm{Ga}$ in ZnO single crystals and ZnO powder as absorber. An external magnetic field of a few hundred oersteds is applied and the value of the magnetic moment of the ${\mathrm{}(1/2)\mathrm{}}^{-}$ first excited state is determined by a quasinull method. We obtain $\mu \left[{\left(\frac{1}{2}\right)}^{-}\right]=+(0.58\mathrm{}\pm 0.03){\mu }_N$. The electric field gradient is determined to be positive.

• Received 6 December 1972

DOI:https://doi.org/10.1103/PhysRevB.7.4044