The data that support the findings of this study are openly available at the following URL/DOI: https://doi.org/10.15125/BATH-01226 [44]. The measured neutron diffraction data sets are available from [45].

44. Salmon P S and Zeidler A 2023 Structure of amorphous materials in the NASICON system Na1+xTi2SixP3-xO12 (Bath: University of Bath Research Data Archive).
45. Salmon P S, Eckert H, Fischer H E, Gammond L V D, Mendes Da Silva R, Mohammadi H and Zeidler A 2019 Structural change in phosphate-based glassy precursors to superionic conducting glass-ceramic electrolytes (Grenoble: Institut Laue-Langevin).