Abstract
The electric field effects in the EPR spectra of low-spin (S = 1/2) Ni3+ tetragonal centers in KTaO3 single crystals are investigated. It is revealed that the resonance lines are split and the centers are oriented as a result of the interaction of the external field with the electric dipole moment of the center. The dipole moment of the center is determined to be p = 100 D = 21 eA. An analysis of the set of experimental data obtained permits one to choose correctly the microscopic models for two nickel centers in KTaO3 crystals among the models discussed in the literature.
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