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KMgF 3 and KZnF 3 crystals doped with Nd 3+ ions were studied using EPR and optical spectroscopy methods. Several types of paramagnetic centers of Nd3+: KMgF 3 -two of tetragonal and one of rhombic symmetry, KZnF 3 --one of tetragonal and one of trigonal symmetry were found. Parameters of the corresponding spin Hamiltonians were determined. Using optical spectroscopy paramagnetic centers Nd 2+ and Nd 4+ in KMgF 3 were found.

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