Similar behavior was observed in EuAl 3 (BO 3 ) 4 microcrystals with electron diffraction. IR spectroscopy studies have also indicated that R32 RAl 3 (BO 3 ) 4 crystals contain ordered monoclinic domains (R = Eu, Gd, Nd, and Y ). As with flux inclusion, polymorph variability disrupts homogeneity, which will increase inhomogeneous linewidth broadening. The resulting local site disruption, likewise, alters symmetry-sensitive 5 D 0 → 7 F J optical transitions of Eu 3+ .