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structure structure (solids and liquids) D 2000 -008Phase Transition and Crystal Structures of LiSn 2 (PO 4 ) 3 .-Compound (IV) shows a reversible phase transition from rhombohedral (space group Rr3rc, Z = 6, 450 K) to triclinic (Pr1r, Z = 2, 250 K) monitored by powder X-ray and neutron diffraction, DSC and 31 P and 7 Li MAS NMR. The high temperature phase has a NASICON-type structure which is responsible for the relationship between conductivity and activation energy. The low temperature phase is a structural distortion of the rhombohedral phase with cages occupied by two Li atoms. The 4-fold coordination of Li appears to be the driving force for the phase transition. -(MORIN, E.; ANGENAULT, J.; COUTURIER, J. C.; QUARTON, M.; HE, H.; KLINOWSKI, J.; Eur. J. Solid State Inorg. Chem. 34 (1997) 9, 947-958; Lab. Cristallochim. Solide, CNRS, Univ. P. et M. Curie, F-75252 Paris, Fr.; EN)

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