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- W2739509007 abstract "Single crystals of PbMoO4 were studied by means of light-induced electron paramagnetic resonance (EPR) and wavelength resolved thermally stimulated luminescence (TSL). The work is focused on the electron self-trapped at the (MoO4)2- complex. Detailed analysis of the EPR spectra of this complex allowed to determine a set of spin-Hamiltonian parameters including g factor and the 95,97Mo, 207Pb hyperfine tensors further used in calculations performed in terms of crystal field and LCAO-MO theories. They have shown a significant overlap of the Mo 5d1 and 6s6p ligand lead orbitals. The contributions of oxygen and lead to the molecular orbitals with an electron trapped at the (MoO4)3- complex were about 14% and 38%, respectively. The decay of the molybdenum center EPR intensity with annealing temperature provided information about thermal stability of the center, which thermally destroys already at 40 K. Trap depth and frequency factor, Et = 0.05 eV, and f0 = 104 s−1, have been determined. The TSL glow curve displays two overlapping peaks in the 40–50 K temperature region, corresponding to the disappearance of the EPR signal from the (MoO4)3- center. By partial cleaning technique and initial rise method it is shown that the lower temperature peak is related to a trap with thermal parameters similar to those determined for the (MoO4)3- center. This allows to correlate it to the thermal destruction of the (MoO4)3- center. The obtained results are discussed in a broader frame of charge trapping mechanism in all the family of tungstate and molybdate-based single crystals." @default.
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- W2739509007 date "2017-12-01" @default.
- W2739509007 modified "2023-10-16" @default.
- W2739509007 title "Electron self-trapped at molybdenum complex in lead molybdate: An EPR and TSL comparative study" @default.
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- W2739509007 doi "https://doi.org/10.1016/j.jlumin.2017.07.066" @default.
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