Abstract

EPR studies have been carried out in Mn 2+-doped paramagnetic single crystals of [Co(H 2O) 6]SiF 6, [Co(H 2O) 6]SnF 6 and [Co(H 2O) 6]PtCl 6 at different temperatures using X-band microwave frequency. Reasonably sharp resonance lines of Mn 2+ have been obtained at room temperature and analysed using the spin Hamiltonian for trigonal symmetry. From the observed linewidths of Mn 2 + in single-crystal [Co(H 2O) 6]SiF 6 the T 1 of Co 2 + has been estimated to be = 3.3 × 10 −11 s. A st phase transition in [Co(H 2O) 6]SiF 6 was observed and the low-temperature phase studied.

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