Abstract
The properties of the electron paramagnetic resonance spectra ofGd3+ ionsin PbWO4 single crystals have been investigated in the X-band microwavefrequency region, in the 1.5 to 290 K temperature range. The observedS4 symmetry of the local crystal field at theGd3+ impurity ions stronglysuggests that the Gd3+ ions substitute for the Pb2+ lattice cations, with charge compensation at a distance. Thespin Hamiltonian parameters are comparable with those of theGd3+ ions in other isomorphous tungstates. The temperature variation of the fine structure parametersB20 and B40 points to an energy transfer between the impurity ions and the host lattice,which takes place mainly through a local vibrational mode of frequencyω = 3.1 × 1013 rad s−1.
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