Abstract
The 19F nuclear resonance spectra and spin-lattice relaxation times have been observed in solid PF3 over the temperature range 77 K to its melting point at 121·8 K. Within this temperature range PF3 exists in three crystallographic phases. Phase I immediately below the melting-point is a plastic crystalline phase in which the 19F nuclear relaxation is dominated by translational diffusion with a correlation time τD satisfying In phase II, threefold reorientations of the fluorine triangle with an activation energy of (8·4±0·2) kJ mole-1 govern the spectra and relaxation rates, whereas in phase III this activation energy is increased to (11·5±0·3) kJ mole-1, the reorientation rate is substantially reduced and it is suggested that rotational polarization effects cause a marked non-exponentiality in the recovery of the nuclear magnetization.
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