Abstract
The KZnLa100%−xSmx(PO4)2 (x=0.1, 1, 5, 10at.%) compounds have been synthesized by a conventional solid-state method. The powder pattern of sample was indexed on the basis of a monoclinic cell, space group P121/A, with the lattice parameters: a=6.839, b=7.703, c=6.511Å, z=4 and V=254.3Å3. The emission spectra recorded at low temperature are composed of transitions from the 4G5/2 multiplet to the 6H5/2 (17566, 17656, 17858cm−1), 6H7/2 (16472, 16540, 16723, 16770cm−1), 6H9/2 (15281, 15320, 15406, 15531, 15569cm−1) and 6H11/2 (13961, 13995, 14045, 14114, 14223, 14259cm−1). The spectroscopic properties were investigated in the range IR–VUV. It was found that the Sm3+ ions occupy position with one point symmetry site. The decay curves were pure exponential for 0.1–1at.% of samarium and become non-exponential for higher Sm3+ concentrations. The Inokuti–Hirayama energy transfer process fit returns R0=10.96Å, Cda=4.04×10−52m6s−1 for S=6. The electron–phonon coupling parameter α was found to be in the range 554–608cm−1 for lines centred at 17858, 16770, 16723 and 15569cm−1.
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