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Abstract
The EPR of Mn(II) doped in single crystals of diamagnetic ZnNbOF 5 · 6H 2O and paramagnetic CoNbOF 5 · 6H 2O is studied at different temperatures. Observation of sharp resonance of Mn(Il) at 300 K and broadening of the resonance lines beyond detection below 120 K in the paramagnetic host is interpreted in terms of the random modulation of the dipolar interaction between Mn 2+ and Coil ions by the fast spin-lattice relaxation of Co 2+ ions. An estimate of the spin-lattice relaxation rate of the Co 2+ ions is made by measuring the linewidth of the dopant Mn(II). The temperature dependence of the EPR parameters of Mn(Il) in CoNbOF 5 · 6H 2O further indicates a structural phase transition at 238 K. The reduction in symmetry in the low-temperature phase as revealed by the site splitting and spin-Hamiltonian parameters is in accordance with the structural aspects of a well studied phase transition in the isomorphous lattice CoSiF 6 · 6H 2O.
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