Abstract
Abstract Reported optical spectra of Mn2+-doped halo apatites are analyzed in octahedral, cubic, and C3 symmetries. Specifically the apatites doped with Mn2+ are Ca10F2(PO4)6, Cd10Cl2(PO4)6, Ca10F1.8Cl0.2(PO4)6, and Sr10F1.8Cl0.2(PO4)6. The cubic approximation was assisted by the use of Tanabe-Sugano-like plots, and the experimental data were averaged for a best analysis where the Slater parameters F(2) and F(4) and the crystal-field parameter B40 were varied. A point charge calculation of the crystal-field parameters for the C3 sites in each of the apatites and the resulting crystal-field parameters, B20, B40, and B43, weer used as starting values in fitting the reported energy levels in C3 symmetry. The parameters that best fit both the cubic approximation and the C3 symmetry are given for each of the apatite host crystals.
Published Version
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