The high quality of the single crystals was evidenced by the sharp diffraction spots, with no streaks observed in the individual reflections. The extinction conditions and indexing of the diffraction pattern confirm the space group 𝐼𝑎3 ̅ 𝑑 (# 230) and rule out symmetry lowering originating from ordering of ions within possible klassengleiche subgroups, with lattice parameters comparable to those derived from the powder samples as can be seen in Table .