Dissolution forms of rare-earth gallium-iron garnets

Abstract

Single crystal spheres of rare-earth gallium-iron garnet crystals (R 3Fe 5− x Ga x O 12, where R = Lu, Yb, Er, Ho, Y, Gd, Eu, Sm and (O ⩽ x ⩽ 5) have been dissolved in acids. It was observed that on dissolution in H 3PO 4, the combination of faces {100} D and {111} D changed into the combination of faces {hk0} D and { hhl} D (where h > l), while on dissolution in HBr the combination of faces {111} D and {111} D was reduced 0 to {111} D when the size of the rare-earth ion and the Ga concentration were increased.