Ce3+ Activated Y[sub 3]Al[sub 5]O[sub 12] and Some of Its Solid Solutions

The systems , , and were studied. It was found that the solid solubility of Ce 3+ in varies with the atmosphere during firing. Only 2 mole per cent (m/o) of Ce 3+ can be dissolved in the yttrium aluminum garnet in air while almost 6% Ce 3+ enters the garnet lattice when fired at 1450°C under a hydrogen atmosphere. Complete solid solutions were observed in the systems and . The cathodoluminescence emission‐peak position of the Ce 3+ ion in host shifted to a longer wavelength while the latttice parameter of the solid solution expanded when Gd 3+ ions were substituted for Y 3+ . On the other hand, the emission‐peak position shifted to a shorter wavelength when the garnet host contained Ga 3+ ions in the Al 3+ position. The lattice parameter of the solid solution increased with Ga concentration.