Abstract
The new family of triple phosphates Ca 9MLn 2 3 (PO 4) 7 ( Ln = rare earth, Y, Bi; M = Li +, Na + has been synthesized and studied by X-ray powder diffraction, IR-spectroscopy, differential thermal analyses and luminescence. All compounds have the whitlockite-like structure (space group R3c). Cell parameters, IR and emission (Eu 3+) spectra are given. The luminescence properties of trivalent europium are analyzed in Ca 9NaEu 2 3 (PO 4) 7 and Ca 9LiEu 2 3 (PO 4) 7 at 290 K. The fluorescence lifetime of the 4F 3 2 − 4I 11 2 transition of Nd 3+ is reported for the solid solutions Ca 9Nd xGd 1 − x(PO 4) 7, Ca 3 − xNd 2x 3 (PO 4) 2 and Ca 9M(Nd xGd 1 − x) 2 3 (PO 4) 7 (M = Li, Na).
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