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Polycrystalline materials of the composition Sr5−x−yCaxEuy(PO4)3Cl with 0 ≦ x ≦ 4.99 and 0 ≦ y ≦ 0.1 crystallize in the hexagonal crystal system. The space group is P63/m. The alkaline earth ions occupy two different crystallographical sites. In addition to X‐ray diffraction measurements, the optical properties are studied at room temperature. Moreover the emission spectra are measured at liquid nitrogen temperature. Refinement of the structure parameters is carried out using the Rietveld method. A varying calcium portion influences the lattice constants a0 and c0 and therefore the luminescence of the samples. The luminescence arises from transitions between 4f65d and 4f7 configurations of the Eu2+ ion.
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Nötzold et al. (1995) studied this question.
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