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The electron paramagnetic resonance of Gd3+ impurity ions in a BiVO4 single crystal, grown by using the Czochralski method, has been investigated with an X-band spectrometer. The rotation patterns of the resonance elds for Gd3+ ions were obtained in three orthogonal crystallographic planes. The spectroscopic splitting tensor g and the zero- eld splitting parameters Bq k's were determined using the e ective spin Hamiltonian. The principal axes of the second order zero eld splitting tensor were also determined. The rotation patterns in the crystallographic planes, together with spin-Hamiltonian parameters of the Gd3+ ions showed that the local site symmetry of the Gd3+ ions in BiVO4 crystal is monoclinic. The energy levels of the ground state for Gd3+ embedded in the crystal were calculated. It turns out that the Gd3+ ion substitutes for the Bi3+ ion without any charge compensation. This is a full analysis of Gd3+ ions and consistent with previous reports.


The electron paramagnetic resonance of Gd3+ impurity ions in a BiVO4 single crystal, grown by using the Czochralski method, has been investigated with an X-band spectrometer. The rotation patterns of the resonance elds for Gd3+ ions were obtained in three orthogonal crystallographic planes. The spectroscopic splitting tensor g and the zero- eld splitting parameters Bq k's were determined using the e ective spin Hamiltonian. The principal axes of the second order zero eld splitting tensor were also determined. The rotation patterns in the crystallographic planes, together with spin-Hamiltonian parameters of the Gd3+ ions showed that the local site symmetry of the Gd3+ ions in BiVO4 crystal is monoclinic. The energy levels of the ground state for Gd3+ embedded in the crystal were calculated. It turns out that the Gd3+ ion substitutes for the Bi3+ ion without any charge compensation. This is a full analysis of Gd3+ ions and consistent with previous reports.