FIGURE 1.Schematic representation of the anion-deficient fluorite structural derivative oxides, going from a fluorite (BO 2) to a bixbyite (A 2 O 3) crystal structure.The cationic sites with ...

SOME time ago, my co-workers and I 1 found that the well-known blue fluorescence band of some fluorites is due to traces of bivalent europium. In later papers2, I showed that europium can easily ...