Abstract
The x CuO(1 − x ) [2P 2 O 5 ·Na 2 O] glasses have been investigated by ESR method. The characteristic parameters: g ∥ = 2.426, g ⊥ = 2.089, A ∥ = 119×10 −4 cm −1 and A ⊥ = 21 × 10 −4 cm −1 were attributed to Cu 2+ ion in an unusual tetrahedral (T d ) configuration. It has also been estimated that an admixture of ⋍ 5% of the 4p z (Cu) orbital in the 3d xy ground state of the paramagnetic electron exists.
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