Synthesis and Structure of Europium Aluminium Garnet (EAG)

Abstract Europium aluminium garnet (Eu 3 Al 5 O 12 , EAG) was synthesized by an aqueous sol‐gel process and subsequent thermal annealing at 800 – 850 °C. Eu 3 Al 5 O 12 crystallizes cubic ( ${\rm (} Ia \bar{\mathit 3} d, {\rm a = 12.140(1)\AA)}$ and its crystal structure was refined from X‐ray powder data. The refined oxygen position in the structure of EAG yields four shorter and four longer distances between europium and the eight surrounding oxygen atoms, forming a distorted dodecahedron. Pure Eu 3 Al 5 O 12 can be treated at temperatures around 1000 °C before it converts into perovskite‐like EAP near 1300 °C.