COORDINATION OF GA3+ IONS IN PBO-GA2O3 GLASSES AS DETERMINED BY GA-71 NMR

Ga-71 NMR spectra of GaAs and beta-LiGaO2 crystals consisting of four-coordinated Ga3+ ions, GaNbO4 and alpha-Ga2O3 crystals consisting of six-coordinated Ga3+ ions, and PbO-Ga2O3 glasses were measured. About 240 ppm difference in chemical shift was observed between the spectra of beta-LiGaO2 crystal and GaNbO4 crystal. It has been found that Ga3+ ions are mainly tetrahedrally coordinated by four oxygen ions in the glasses by comparison of spectra of the glasses with those of the crystals.