Ionic and Electronic Conduction in TiNb2O7 - Griffith, Kent J; Seymour, Ieuan D; Hope, Michael A; Butala, Megan M; Lamontagne, Leo K; Preefer, Molleigh B; Koçer, Can P; Henkelman, Graeme; Morris, Andrew J; Cliffe, Matthew J; Dutton, Siân E; Grey, Clare P (Journal of the American Chemical Society, 2019)