Abstract
A new compound KMgLa(PO 4) 2, isotypic with monoclinic LaPO 4, is reported. Its cell parameters have been determined from X-ray powder diffraction data. Crystallization occurs in the monoclinic space group P2 1/ n (No. 14) with a = 6.839(3)Å, b = 7.066(1) Å, c = 6.523(3) Å, β = 103.42(4)°, and Z = 2. It was found that the KMgLa(PO 4) 2 phase was isostructural with monoclinic LaPO 4. The difference between them was that half of the La atoms in LaPO 4 were couplingly substituted with the same amount of Mg and K atoms. This isomorphous substitution was confirmed by IR and Eu 3+-doped excitation and emission spectra and by elemental analysis of single crystals. The spectroscopic data were compared with those of LaPO 4:Eu 3+.
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