ملخص: Single crystals of CsPrP4O12 and RbPrP4O12 cyclotetraphosphates were grown using the flux method. CsPrP4O12 crystallizes in the cubic I-43d space group whereas RbPrP4O12 crystallizes either in the cubic I-43d or monoclinic C2/c space group. The Pr3+ ions occupy sites of S4 and C2 symmetries in the cubic and monoclinic phases, respectively, with an eightfold coordination in both phases. The present work reports on an analysis of the Pr3+ 4f2 energy level diagram based on the low temperature fluorescence spectra under laser selective excitation in the 3P2 states of the cubic CsPrP4O12 and monoclinic RbPrP4O12 compounds. The experimental energy levels are fitted using the SPECTRA program available on the Argonne National Laboratory website. The best fits lead to standard deviations in the order of 28 and 21 cm-1 for the CsPrP4O12 and RbPrP4O12 materials, respectively.

لغة: إنجليزية