Nuclear magnetic resonance measurements, using 27Al, 31P and 7Li, were performed on Li-conducting ceramics which were based upon this structure; with Al, V or Nb ions substituted for Ti or P. The 27Al magic-angle spinning data revealed that, although Al was intended to substitute at octahedral Ti sites, additional substitution into tetrahedral environments (presumably P sites) occurred with increasing amounts of added Al. This tetrahedral substitution appeared to occur more readily in the presence of V, whereas similar Nb additions (in place of V) appeared to suppress tetrahedral substitution. The 7Li static nuclear magnetic resonance spectra revealed a quadripolar structure; more or less regardless of substitutions. Measurements of the 7Li central transition linewidth at room temperature revealed the presence of a relatively mobile Li species (300 to 900Hz) whose linewidth tended to decrease upon Al substitution and increase with increasing V or Nb additions.

NMR Studies of Modified Nasicon-Like Lithium Conducting Solid Electrolytes. M.Forsyth, S.Wong, K.M.Nairn, A.S.Best, P.J.Newman, D.R.MacFarlane: Solid State Ionics, 1999, 124[3-4], 213-9