Similar to the powder XRD results, as can be seen in Figure , approximately linear trends are observed for Gd3In2Ga3O12:Nd 3+ and Gd3In2Ga3O12:Ho 3+ as lattice parameters (da/dx and dV/dx) increase/decrease. The quantification of the incorporated RE³⁺ ions is detailed in Table , confirming the stoichiometric transfer to the single crystals within the error margin of this method for RE = Nd and Ho with larger amounts of elements being incorporated for increasing x of the starting material. In contrast to the literature , GIGG:RE 3+ single crystals were successfully synthesized in stochiometric form.