No abstract

The electron paramagnetic resonance spectrum of trigonal Fe 3+ centres has been investigated and parameters of the spin Hamiltonian obtained for nominally pure congruent LiTaO 3 crystals annealed at ∼1500 K under Li 2 O vapour pressure corresponding to the pressure over the stoichiometric lithium tantalate. The possibility of calculating the zero-field splitting of the ground state of the impurity ion on the basis of the superposition model is discussed.