The ramsdellite phase, Li2Ti3O7, was used as a basis for H+ exchange; to form Ti3O7H2. The ramsdellite structure of this compound was confirmed by X-ray diffraction, and its composition was confirmed by thermogravimetric analysis. Magic-angle spinning solid-state nuclear magnetic resonance data showed that the protons occupied at least 2 sites in the ramsdellite structure; in accord with the proposed Ti3O7H2 formula. The conductivity of compressed compacts of this compound was equal to 2.66 x 10-6S/cm at 200C. This was about an order of magnitude lower than that of the Li analogue, and 2 orders of magnitude lower than that of the best perovskite ceramic proton conductors at this temperature.

Hydrogen Titanates as Potential Proton Conducting Fuel Cell Electrolytes. D.J.D.Corcoran, D.P.Tunstall, J.T.S.Irvine: Solid State Ionics, 2000, 136-137, 297-303