Abstract
A polycrystalline sample of Na 3Cr 2P 3O 12 has been studied by Quasielastic and Inelastic Neutron Scattering in the 303–673 K temperature range. For Q ⩽ 0.5 A ̊ −1 a strong quasielastic contribution is observed. It has a lorentzian shape and its width varies as DQ 2. It has been interpreted in terms of magnetic scattering. Above Q=1 A ̊ −1 it gives rise to a broad signal which can be considered as a flat background as regards to the IN6 resolution (∼130 μeV), while a narrow component develops; this component has been fitted with a model of Na jumps. No quasielastic scattering has been observed for NaZr 2P 3O 12 and Na 3ZrMgP 3O 12. Inelastic spectra for the three compounds have been recorded up to 600 cm −1 and discussed in terms of vibrational amplitudes. The structure of Na 3Cr 2P 3O 12 at 573 K has been studied by neutron diffraction.
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