ESR Analysis of ${\mathrm{Pb}}^{3+}$ Ions in ${\mathrm{Y}}_3$${\mathrm{Ga}}_5$${\mathrm{O}}_{12}$

Trivalent lead impurity ions $5d^{10}6s^1$ have been detected by electron-spin resonance (ESR) to occur in diamagnetic garnet crystals of ${\mathrm{Y}}_3$${\mathrm{Ga}}_5$${\mathrm{O}}_{12}$ which were grown from a PbO-Pb${\mathrm{F}}_2$ based flux. From the observed weak anisotropy of the ${\mathrm{Pb}}^{207}$ hyperfine interaction, it could be positively established that the ${\mathrm{Pb}}^{3+}$ ions occupy the dodecahedral sites in the garnet lattice. Trivalent lead impurity ions were also found to occur in the other diamagnetic garnet hosts, ${\mathrm{Y}}_3$${\mathrm{Al}}_5$${\mathrm{O}}_{12}$, ${\mathrm{Lu}}_3$${\mathrm{Ga}}_5$${\mathrm{O}}_{12}$, and ${\mathrm{Lu}}_3$${\mathrm{Al}}_5$${\mathrm{O}}_{12}$.