Abstract

Ion-pathways in a NASICON-related compound NH 4Ti 2P 3O 12 (hexagonal, a = 0.832 and c = 2.34 nm) are directly observed by means of high-resolution transmission electron microscopy. When the composition changes to Ti 4P 6O 23 due to the deammoniation as well as dehydration of heating at 770°C, a supercell with the dimensions of A ⋍ 2a and C ⋍ 2c is constructed. A model of the superstructure is proposed based on the arrangement of oxygen vacancies as well as the induced distortion of the TiO 6 octahedra, retaining the three-dimensional network in the starting structure.

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