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ChemInform Abstract Eulytite-like compounds A3.5B0.5(PO4)3 with A/B= Pb/Th, Pb/Ti, Sr/Th, and Ba/Th are synthesized and their structures are studied. Despite the long annealing times (several days at 600-800 rc C) no superstructure is observed, i.e., the cationic sites are randomly occupied. After incorporation of Eu3+, the emission spectra reveal a local ordering in the Pb compounds. This ordering is discussed in terms of the covalency of the Pb-O bonds and the stereochemical role of the lone electron pair of Pb(II).

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